O'Gradys Hotel (Restaurant / Music Bar, 1 gig, Redcar)
O'Neill's (Pub, 18 gigs, Woking)
O'Neill's (Pub, 4 gigs, Oxford)
O'Neill's (Pub, 2 gigs, High Wycombe)
O'Neill's (Pub, 22 gigs, Kingston Upon Thames)
O'Neill's (Pub, 1 gig, Northampton)
O'Neill's (Pub & Food Bar, 17 gigs, Sutton)
O'Neill's (Pub & Food Bar, 7 gigs, Watford)
O'Neill's (Pub / Restaurant, 4 gigs, Winchester)
O'Shea's Bar & Grill (Pub & Food Bar, 1 gig, Luton)
Oak, The (Pub, 4 gigs, Kingston Upon Thames)
Oak, The (Pub, 1 gig, Baginton)
Oake Manor Golf Club Ltd (Golf Club, 2 gigs, Oake)
Oake Village Hall (Village Hall, 1 gig, Oake Green)
Oakland Hotel, The (Hotel, 1 gig, South Woodham Ferrers)
Oaklands Hall Hotel (Hotel, 2 gigs, Laceby)
Oceana Hotel (Music Venue, 1 gig, Bournemouth)
Odd Wheel, The (Pub, 1 gig, Wembury)
Oddfellows Arms, The (Pub, 52 gigs, Hemel Hempstead)
Oddstock (Music Venue, 1 gig, Apsley)
Odiham and Grewell Cricket Club (Sports Club, 1 gig, Odiham)
Off The Tap (Live Music Pub, 1 gig, Maidenhead)
Offshore Restaurant (Café Bar / Restaurant, 8 gigs, Torquay)
Okehampton Conservative Club (Other, 8 gigs, Okehampton)
Okehampton Rugby Club (Private Members' Club, 1 gig, Okehampton)
Okehampton Show (Event Venue, 1 gig, Okehampton)
Okey Music Day (Festival, 1 gig, Okehampton)
Old Albion (Live Music Pub, 1 gig, Crantock)
Old Anchor Inn, The (Live Music Pub, 6 gigs, Abingdon-on-Thames)
Old Badger Inn, The (Pub, 1 gig, Eastington)
Old Barn (Hotel, 3 gigs, Marston)
Old Barn Club, The (Club, 1 gig, Yeovil)
Old Bell, The (Pub, 1 gig, Saham Toney)
Old Cinema Launderette (Music Venue, 1 gig, Gilesgate Moor)
Old Cock Inn (Private Party, 1 gig, Harpenden)
Old Courts, The (Other, 1 gig, Wigan)
Old Ford, The (Outdoor Event, 3 gigs, North Camp)
Old George, The (Pub / Restaurant, 4 gigs, Stony Stratford)
Old Hall Tavern (Pub, 26 gigs, Chingford)
Old Hat, The (Pub & Food Bar, 3 gigs, West Ealing)
Old House, The (Pub / Restaurant, 3 gigs, Dorking)
Old Inn, The (Other, 5 gigs, Malborough)
Old Jail (Pub, 2 gigs, Biggin Hill)
Old Mill, The (Pub & Food Bar, 1 gig, Plumstead Common)
Old Pier Tavern, The (Music Venue, 47 gigs, Burnham-on-Sea)
Old Pound Inn, The (Pub / Hotel, 5 gigs, Langport)
Old Red Lion (Live Music Pub, 5 gigs, Staines)
Old Riverport Jazz & Blues Festival (Festival, 2 gigs, St Ives)
Old Rothschild Arms, The (Pub, 1 gig, Aston Clinton)
Old Ryden (Pub, 1 gig, Kingskerswell)
Old School @ Pelynt, The (Private Members' Club, 2 gigs, Pelynt)
Old Sergeant, The (Live Music Pub, 1 gig, Wandsworth)
Old Ship Aground, The (Inn / Restaurant, 1 gig, Minehead)
Old Smithy, The (Pub, 4 gigs, Ivybridge)
Old Sun, The (Pub / Restaurant, 1 gig, Harlington)
Old Talbot, The (Pub / Restaurant, 2 gigs, Potterspury)
Old Ticket Hall (Pub, 18 gigs, Windsor)
Old Town Live At The Mulberry Tree (Pub & Food Bar, 1 gig, Stevenage)
Old Transporter Ale House, The (Pub, 3 gigs, Henlow)
Old Uxbridge Road Rickmansworth (Open Air Festival, 1 gig, West Hyde)
Old Vicarage Care Home (Care Home, 1 gig, Weekley)
Old Vine, The (Pub, 2 gigs, Cousley Wood)
Old Wainhouse Inn, The (Pub & Food Bar, 1 gig, Wainhouse Corner)
Old Windsor Club (Social Club, 1 gig, Windsor)
Olive Branch, The (Other, 2 gigs, Horsham)
Oliver Cromwell (Other, 1 gig, St Ives)
One World Cafe (Bar / Brasserie, 2 gigs, Torquay)
Ongar Festival (Festival, 1 gig, Ongar)
Ongar Sports Club (Sports Club, 1 gig, Ongar)
Only Rock N Roll (Dance Club, 1 gig, Sale)
Orange Tree, The (Live Music Pub, 1 gig, Hitchin)
Orangery Cafe and Bistro, The (Café Bar / Restaurant, 1 gig, Exeter)
Orangery, The (Restaurant, 1 gig, Powderham)
Orb & Sceptre (Pub / Restaurant, 3 gigs, King's Lynn)
Orchard Coffee and Co, The (Café / Music Bar, 1 gig, St George)
Oscars Wine Bar (Wine Bar, 1 gig, Crewkerne)
Osea Holiday Park (Holiday Resort, 1 gig, Maldon)
Ostler Inn (Pub / Hotel, 1 gig, Uffculme)
Ostrich Inn, The (Bar, 2 gigs, Peterborough)
Ousebank House (formerly Royal British Legion) (Royal British Legion Club, 10 gigs, Newport Pagnell)
Outdoor Event (Outdoor Event, 1 gig, Polsham)
Overdraught, The (Pub, 1 gig, Park Street)
Ox and Gate, The (Pub, 1 gig, Cricklewood)
Oxted British Legion 42 Church Lane (Club, 1 gig, Oxted)
Total 84