MVE,anymore posts like that and we will have to swaps seats...
Aerofoil, the stall speed of an aircraft will increse by 19% in a 45 degree bank i.e. a stall speed of 50kts would become 60kts (59.5) and the stall warner therefore coming on at 65kts. Check the aircrafts Pilot Operating Handbook for recommended speeds.
On a personal note I would not like to fully stall the aircraft whilst in a 45 degree bank.
Most importantly, sit and discuss it with your instructor....its what you pay him/her for.