Les,
Not to worry, maybe next time (although I'm sure you'll be over here before I make my next trip over).
Well I enjoyed the weekend. We were staying in Kings Cross and as chance would have it there was a pub on either side, one of which was part of the O'Neills chain (like the McDonalds of Irish pubs so we avoided this) and on the other side was a Fuller's pub 'The Euston Flyer'. We decided that this would be a good starting point. On tap they had London Pride, ESB, India Pale Ale and a guest beer called Dark Star Hop Head (which was very nice).
After a few pints we decided we'd better head and off we went in search of the Wenlock Arms where they had seven or eight real ales on tap - off the top of my head I can remember Adnams Tally Ho (barley wine), Adnams Bitter, Grand Union Mild, Acorn Dark Ale, Old Spot, Pitfield St. George's Ale and Caledonian XPA - later in the evening the XPA ran out and was replaced by Exmoor Gold.
Most of the beers were solid offerings, the Old Spot was well liked. I had been looking forward to trying the XPA but I found it rather underwhelming. The Wenlock itself won't win any awards for decor and it's a bit tired looking but the beer selection is very good, the locals were very friendly and the salt beef sandwiches on huge doorstop bread were a big hit. They are a meal in themselves, so much so that we needed to ease off the pints for a while we were so full. So all in all I would definitely reccomend the Wenlock and a big Thanks to all who suggested it.