| Oakham |
Rutland |
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| Oakham Castle |
Rutland |
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| Oakham, All Saints Church |
Rutland |
|
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| Oakhurst Cottage |
Surrey |
National Trust |
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| Oakley |
Bedfordshire |
|
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| Oare |
Somerset |
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| Oare, St Mary's Church |
Somerset |
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| Oborne, St Cuthbert's Church |
Dorset |
Churches Conservation Trust |
|
| Octavia Hill Birthplace Museum |
Cambridgeshire |
National Trust |
|
| Odda's Chapel |
Gloucestershire |
|
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| Odell |
Bedfordshire |
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| Odell Castle |
Bedfordshire |
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| Odiham Castle |
Hampshire |
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| Offord Darcy, St Peter's Church |
Cambridgeshire |
Churches Conservation Trust |
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| Offwell, St Mary's Church |
Devon |
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| Ogbourne St Andrew's Church |
Wiltshire |
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| Ogbourne St George Church |
Wiltshire |
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| Okehampton |
Devon |
|
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| Okehampton Castle |
Devon |
English Heritage |
|
| Old Amersham, St Mary's Church |
Buckinghamshire |
|
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| Old Bailey Central Criminal Court |
Greater London |
|
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| Old Bewick, Holy Trinity Church |
Northumberland |
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| Old Cleeve, St Andrew's Church |
Somerset |
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| Old Dilton, St Mary's Church |
Wiltshire |
Churches Conservation Trust |
|
| Old Gaol Museum |
Buckinghamshire |
|
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| Old Gorhambury House |
Hertfordshire |
English Hertitage |
|
| Old House Museum |
Derbyshire |
|
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| Old John Tower |
Leicestershire |
|
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| Old Langho Church |
Lancashire |
Churches Conservation Trust |
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| Old Malton Priory |
Yorkshire |
|
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| Old Man of Coniston |
Cumbria |
|
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| Old Manor |
Derbyshire |
National Trust |
|
| Old Mother Hubbard's Cottage |
Devon |
|
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| Old Operating Theatre Museum |
Greater London |
|
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| Old Oswestry Hillfort |
Shropshire |
English Heritage |
|
| Old Romney, St Clement's Church |
Kent |
|
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| Old Royal Naval College Greenwich |
Greater London |
|
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| Old Sarum |
Wiltshire |
English Heritage |
|
| Old Soar Manor |
Kent |
National Trust |
 |
| Old St Lawrence Church Tower |
Yorkshire |
Churches Conservation Trust |
|
| Old Wardour Castle |
Wiltshire |
English Heritage |
|
| Old Weavers House |
Kent |
|
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| Old Winchester Hill |
Hampshire |
|
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| Oldbury Castle Hillfort |
Wiltshire |
National Trust |
|
| Oldbury-on-the-Hill, St Arild's Church |
Gloucestershire |
Churches Conservation Trust |
|
| Oliver Cromwell's House |
Cambridgeshire |
|
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| Orcheston, St George's Church |
Wiltshire |
Churches Conservation Trust |
|
| Orcop, St John's Church |
Herefordshire |
|
|
| Orford Castle |
Suffolk |
English Heritage |
|
| Orford Ness National Nature Reserve |
Suffolk |
National Trust |
|
| Orford, St Bartholomew's Church |
Suffolk |
|
|
| Oriel College, Oxford |
Oxfordshire |
|
|
| Orleans House Gallery |
Greater London |
|
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| Orleton, St George's Church |
Herefordshire |
|
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| Ormesby Hall |
Cleveland |
National Trust |
|
| Osborne House |
Isle of Wight |
English Heritage |
|
| Osmotherley |
Yorkshire |
|
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| Osmotherley, St Peter's Church |
Yorkshire |
|
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| Osterley Park |
Greater London |
National Trust |
|
| Otley Hall |
Suffolk |
|
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| Otterburn |
Northumberland |
|
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| Otterburn Mill |
Northumberland |
|
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| Otterburn, St John's Church |
Northumberland |
|
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| Otterhampton, All Saints Church |
Somerset |
Churches Conservation Trust |
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| Otterton Mill |
Devon |
|
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| Otterton, St Michael's Church |
Devon |
|
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| Ottery St Mary |
Devon |
|
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| Ottery St Mary Church |
Devon |
|
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| Ottringham, St Wilfrid's Church |
Yorkshire |
|
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| Over Bridge |
Gloucestershire |
English Heritage |
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| Over Peover, St Lawrence Church |
Cheshire |
|
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| Over Wallop, St Peter's Church |
Hampshire |
|
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| Over, St Mary's Church |
Cambridgeshire |
|
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| Overbeck's Museum and Garden |
Devon |
National Trust |
|
| Ovingham |
Northumberland |
|
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| Ovingham, St Mary's Church |
Northumberland |
|
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| Owen Tudor Execution Plaque |
Herefordshire |
|
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| Owletts |
Kent |
National Trust |
|
| Owlpen Manor |
Gloucestershire |
Historic Houses Association |
|
| Oxborough, St John's Church |
Norfolk |
|
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| Oxburgh Hall |
Norfolk |
National Trust |
|
| Oxford |
Oxfordshire |
|
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| Oxford Botanic Garden |
Oxfordshire |
|
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| Oxford Castle |
Oxfordshire |
|
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| Oxford Painted Room |
Oxfordshire |
Oxford Preservation Trust |
|
| Oxford University Museum of Natural History |
Oxfordshire |
|
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| Oxford, Christ Church Cathedral |
Oxfordshire |
|
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| Oxford, Corpus Christi College |
Oxfordshire |
|
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| Oxford, Exeter College |
Oxfordshire |
|
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| Oxford, St Cross Church |
Oxfordshire |
|
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| Oxford, St Ebbe's Church |
Oxfordshire |
|
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| Oxford, St Giles Church |
Oxfordshire |
|
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| Oxford, St Mary Magdalen Church |
Oxfordshire |
|
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| Oxford, St Michael at the North Gate Church |
Oxfordshire |
|
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| Oxford, University Church of St. Mary the Virgin |
Oxfordshire |
|
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| Oxfordshire Museum |
Oxfordshire |
|
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| Oxhey Chapel |
Hertfordshire |
Churches Conservation Trust |
|
| Oxhill, St Lawrence Church |
Warwickshire |
|
|
| Oxnead, St Michael's Church |
Norfolk |
|
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| Ozleworth |
Gloucestershire |
|
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| Ozleworth, St Nicholas Church |
Gloucestershire |
Churches Conservation Trust |
|
