Hi - dunno if I was lead by your Hornsey suggestion (I ruled out the old Red Cow, Hammersmith straight away, particularly as that was a Fuller's pub...) but I got a hunch it could be the Queen's Hotel - but I don't what ale it serves - but I drove past it a few months back one night and recognised it instantly where they shot the pub scenes in Love Honour and Obey with Ray Winston et al.
It's in Hornsey. Tottenham Lane. Hope that helps. The Salisbury is another idea, but that looks too big. I'd opt for Queen's until something better comes along!