Heathrow Hotel sells real ale
There are may hotels in the Heathrow area, but very few (if any) have been known to sell real ale. However a handpump has been spotted at the Crowne Plaza Heathrow on Stockley Road and was recently selling a beer from Windsor & Eton. It is only available in O'Driscolls which is the small bar which can be found down a corridor past the main bar. The bar has limited opening hours. See the WhatPub entry here.