Tilly, if I can offer some points from my own experience:
apply now for your NI exemption status - as soon as you reach retirement age, you give that to your employer so they no longer deduct NI from you, it can be quite a saving.
Get your pension forecast, but if by any chance you don't need to claim it yet, you can defer it, and they pay you an extra 10.4% p.a. in respect of the years you don't claim (e.g. if you defer 5 years, you get 50% extra per week, with the option to take part of that as a lump sum at the time you decide to claim). Although there is an argument that cash in your hand is better value, your pension can push up your annual income meaning that your employed pay is really wallopped for tax - mine was as they apply your allowances to your work pay, so you still get your pension free of tax.
It took quite a while to sort out the forecast, some weeks, so it's worth asking now and considering your options. I had a spreadsheet of "what ifs" before I decided what to do.