£52kpa + another £12kpa in duty pay gives you £64000 per year. At current tax rate that netts you approximately £3700 per month after tax and NI. If you pay the max 6% into your pension then your take home becomes £3500.
On top of that are your allowances at approx £650 per month. These are, I believe, taxed at a very marginal rate (if at all) and so you can expect to see £5-600 of that in your pay packet. Take home pay, per month then would be approximately £4100 per month.