That allowed me to go to my hotel, check in, shower, take breakfast and then work a full day.
If you have time on the way back (I'm presuming you're on the outbound leg) then the Arrivals lounge is the one oasis of excellence left both within British Airways
and T5. Really worth a visit. On First/Gold, the Concorde Room for breakfast is almost the way travelling used to be but Terraces/Showers etc is also V.Good.