The tournament is the £150 +1 re-buy or add on at the Rendevouz Casino in Brighton.
We are at Level 4, blinds 150/300.
I have 18k, villan has 14k (average is about 17k)
Villain is a competent player who plays many big buy in tournaments.
He has shown down 2 hands when called after making big bets, one a complete bluff, the other the nuts.
I have a fairly tight image, having won a few small pots and the only hand i have shown after a raise got through uncontested was queens about 10mins previous.
UTG+1 villain limps.
In mid position i look down at

and make it 1000.
All fold to villain who calls.
Flop

Villain checks - i make it 1200, villain calls.
Turn

Villain checks again, i make it 3000, villain calls.
River

Villain pushes for 8k
What should i do?