I was interested to see The Harp, Covent Garden gain CAMRA's POTY accolade. A few minutes walk from Trafalgar Square, behind St Martin's In-the-Field church it's easily accessible for we tourists from the northern wastelands.
I've only been there once (that will be rectified soon) and found it very welcoming pub with an excellent range of mostly local ales in excellent condition. But I found it impressive for another reason. On 28th December when the capital was teeming with visitors it was open as normal unlike some other well known pubs in London who displayed a 'stuff you' attitude in closing for days on end.