Thanks to a pair of schedule cancellations, my 2.5 hour layover at LHR is now a 5 hour layover. Can't do much about it because it's award travel, so I'm trying to figure out how to make the experience as pleasant as possible. I'm an AA platinum and my parents are on a AA->BA international F award, so the three of us should be allowed into the BA Club lounge. We have a 2+ hour layover on the way back where my mom is already looking forward to shopping at Harrods.

So, I figure the schedule is something like this:

Hour 1 - get from T3 to T1, get better seat assignments for LHR-LIN, get on the waiting list for the showers
Hour 2 - rotate through the showers in the club lounge, drink coffee and read the London papers
Hour 3 - ???
Hour 4 - find a nice sit-down restaurant for lunch
Hour 5 - ???

Suggestions?

My parents have been to London before and they're not terribly mobile - if I was alone I'd try to stash the luggage and go into London for a long walk.