It's dreadful. A shoe box sized lounge with warm cans of coke and some salted snacks.
Since TRN is a pleasantly small airport, there's really no need to get there more than 1:15 before the flight if in Club.
Post security has hardly any shops, but huge windows overlooking the single runway. I would dodge the lounge all together, buy a (fairly decent) cup of coffee from the small cafe place airside and grab a window seat to wait it out. If you're there more than 35 minutes or so before your flight time, you'll see the BA flight land.