Bet or check or does it matter?

[PokerBob]

SB I know very little about other than that he likes to berate other players and is 45/15 according to PA. UTG is unknown.

Party Poker 5/10 Hold'em (6 max, 6 handed) converter

Preflop: Hero is CO with K[img]/images/graemlins/club.gif[/img], Q[img]/images/graemlins/club.gif[/img].
UTG calls, <font color="#666666">1 fold</font>, <font color="#CC3333">Hero raises</font>, <font color="#666666">1 fold</font>, SB calls, <font color="#666666">1 fold</font>, UTG calls.

Flop: (7 SB) 8[img]/images/graemlins/diamond.gif[/img], 7[img]/images/graemlins/club.gif[/img], 4[img]/images/graemlins/spade.gif[/img] <font color="#0000FF">(3 players)</font>
SB checks, UTG checks, bet or check or does it matter?