I remember 'Charlie Brown's' being the actual pub name, and that it was a different pub from the Blue Posts. However, a bit of research shows that Manitas is right too: there were two individuals called Charlie Brown - father and son - and each kept a pub named after himself on either side of the road. It was Charlie Jr who left the Blue Posts and set up in Woodford.

There's some interesting information about Charlie
here

Correction: the pub in which I had an encounter with unsympathetic West Ham fans was actually the City Arms on the Island. The Londoner was the pub in Limehouse, at the junction of Commercial and West India Dock Rd. It had a sign up in the bar banning drug dealers, prostitutes, drunkards, etc, but it always looked as though all of the regulars fell into at least one of these categories. I remember going into a Chinese restaurant to get a takeaway when I first moved to the Island in 1976 - the place doubled as a laundry and was like a movie caricature of Chinatown in the 1940s. Nice food, though.