Bloody Hell! £200 to £300 a month! Makes our fifty pence a day Op Banner money look a bit puny! I can well remember how 'chuffed' the boys were to get the £3.50 per week. It was always left as credits to draw for R and R.Going back to your original question - at the time I seem to recall I easily lived off my LOA which would have been between £200-300 per month. The exchange rate is about the same now at 3:1.
A bottle of Belican was set at $1 and the local rum - Crystal was approx. £3. Going rate at Rosies was £10ish if that's your thing.