The Constant Service?
It's not really anywhere near the Amex though.
That's the one. I've popped in occasionally in the last few years and spotted fellow blues but never been that keen on it to be honest, no real reason. Lived around there for a few years but always preferred other pubs, a couple which have gone now. I still drink in a couple of boozers close by, one when watching City which is predominantly Brighton but a few Chelski and dipper fans go and we just annoy each other!