As title says this is my first PHA post. Think I made a complete mess of the hand but would still like some thoughts. Constructive criticism was the reason I joined here, so here goes...
£150 tourney at DTD last night. 92 runners, 60 left, pays to 12.
Blinds: 1200/600/100 (and just about to go up to 1600/800) & table is 9 handed
Stack: 39K most opponents have me covered but none by very much
Image: I generally do play tight and in 4 hours had only shown down 3 hands which were KTs, AJs & AA. However I'm not sure the table neccessarily considered me to be that tight as they seemed to have noticed my aggression in the few hands I had won rather than all the hands I had folded
I get

UTG and raise to 2,700. 4 players call, with the last one being the BTN (blinds both fold). With the exception of 1 they all have me slightly covered.
Pot - 16,200
Flop -

I check, then the next 3 players check, all of whom I'm almost certain would have bet practically all strong hands. The BTN, who's playng about 49K, then bets 10K. He is quite an old guy, has played quite straight-forward apart from 1 hand where he made a big raise with 44 on a 3-5-6 flop with 5 players in the pot, and he seems to overbet the pot when strong (although it's likely he doesn't think in terms of pot fractions etc)
So action is back on me.....
Snap-fold?
Snap fold pre-flop?