Some sound advice.
I can agree with the 50:50 split between the FTSE 100 (or 250) and maybe the All share. But only for your ISA saving/rainy day monies.
I think a proper pension should have more diversification. If you don't want to pay a pension company a whacking percentage of your money (compound interest is quite an eye opener) then you could start by reading an excellent book called Smarter Investing, by Tim Hale.
I used to pay a local firm to do my pension for me, but after reading this book and much www info, I decided to take the plunge into a self managed SIPP. I now have total control over my own finances and run it via Hargreaves Lansdown.
And fwiw, I'm 80% invested into just this one fund. (I play a bit with the other 20% - sensibly)
It's a very well balanced tracker "fund of funds" with a relatively high risk, equities biased structure.
http://www.hl.co.uk/funds/fund-disco...ulation/charts