Ok guys, this is a hand that occured during the GUKPT side event on Saturday. £250 buy in.
30 players left, average 21k, i'm on 35k. 13 paid. blinds 400/800/75. seat 10 is the button. Ben Vinson (85k) had recently joined the table raises from seat 7 to 2.2k, he had been opening a lot of pots, roughly 40% whilst on my table. I looked down at

in seat 9 and flat call, everyone else folds.
Flop

, Ben checks, I decide to check a very innocuous flop, hoping to disguise my hand strength. Turn brings

, Ben bets 2.4k, I decide to raise to 6k, he flats. River brings

, Ben checks to me. Now what?
Comments on how the hand played please, but more importantly, what should my move be on the river, am I losing value by checking?