Today, the government announced that the state pension age (SPA) rise will be brought forward. The rise in the pension age to 68 will now be phased in between 2037 and 2039, rather than from 2044 as was originally planned. See: http://www.bbc.co.uk/news/business-40658774
Having retired early myself, I can't stress enough how advantageous it is to start a non-state pension scheme to make you independent before SPA.
If you have a workplace (occupational / works / company) pension your employer has to chip in and it's tax free. The important thing is to start it as early as you can. Over your working life you turn, say, £2000 into £40,000 and take 25% of that as a tax free lump sum when you activate your pension - and when you do that is up to you, it doesn't have to be at SPA. You could even do that and carry on working if you really wanted to.... and the more you put in, the greater the pension pot. £100,000 isn't an impossible or even difficult pot to achieve...
I've put together a bit of a guide for anyone thinking of retiring. Retirement Planning
If you want to download it to your computer as a XLSX workbook, you can use LibreOffice (free)
to edit it.
There is lots of advice scattered over the Internet enticing you to spend money on advice and trying to rope you into various financial schemes. You only retire once, usually, so it's best to take lots of time to understand what's going on rather than jumping in feet first. Don't get scammed. The Money Advice Service produces a booklet, Your Pension: It's time to choose
, which does a lot of explaining.
I can't give financial advice but may be able to give explanations. Good luck !