I have just over 6hrs at LHR next weekend. Provided my inbound operates ontime, I plan to HEX to Paddington and meet a friend for brunch.
I’m eGates eligible, will not have bags to worry about and can use The First Wing or Fast Track arriving back.
I’ve done a quick trip to Harrods in 4.5h before: but decisions are best day-of, depending on timings.