How it compares financially I don't know, but someone drew my attention to the fact that Family Investments had an ethical CTF, and I also discovered that I could apply online and then they'll just send me an envelope to post the CTF voucher in. Even I might manage that, and I thought it was a good idea to just go for it and get it done. Which best buys only seem to compare cash CTF interest rates and my mum seemed to think I should do a proper investment (yes, I still consider what my mum thinks even at the grand old age of 38)
yes you should definitely do a share based one. Over 18 yrs would be criminal to put it in a cash account - start transferring into cash in stages say 20% per year ion teh run up to 18 to minimise risk.
Kewcumber, FWIW it was me did the F&C Smaller Companies fund, on the basis that it was a small amount of money in the great scheme of things, so it made sense to do a more speculative investment. None of our other investments are with F&C, and all are pretty boring trackers or international general ITs, so thought it would be sensible to choose a different provider and type of fund to spread the risk around a bit.
I did read somewhere that it was the 2nd best-performing CTF over 3 years or so, so it was obviously a lucky guess.
Fool.co.uk used to have quite an active discussion section including CTFs, so you might be able to get more experiences there. Would imagine the moneysavingexpert boards might also have stuff on this topic.