Live AK small blind - whats your play and why?

[nighthawk]

Live £5 rebuy tourney - Crapshoot format (20mins blinds post rebuy period)

207000 Chips in Play 6 Handed - 400,800 Blinds
All players involved in this hand have approximately 7K in chips.

UTG+1 - Raises all in
Hero(SB)- AK os

BB calls instantly out of turn because he thinks I've passed. I call play back to me whats my move?

UTG - I am certain (90%+) UTG hand is Ax where x is most probably Q,J,10 (80%+). I'm 100% calling UTG+1 raise.

BB seems fairly solid calls but lots of loose raises with connectors but passes all-ins. I am fairly certain BB reads UTG as per my read. I put UTG on PP 80% here. I don't think BB is folding if I move my chips in.


Over to you please....