I've just discovered that the UK pension age is now 66 for people born after a certain date - in my case between 1954-1960. There are also plans to increase the date even further because people are living longer and eventually that age will be 68.
Anyway, there are some handy HMRC pages available for showing your state pension, any shortfall and how much you would need to pay to bring the weekly amount to £175.20.
Also here's a guide state pension age timetables.
https://assets.publishing.serv…/310231/spa-timetable.pdf
UK state pension age increases to 66 – and is set to rise further