In reply to Frank the Husky:
I've been putting some money into Ratesetter for 18 months or so.
It's not FSCS protected. They do have their own arrangements for missed payments (their "provision fund".) They give information on the administration of the fund, the current and projected default rates, and the size of the fund. After that you have to make a judgement for yourself on the security of your money. My uneducated feeling is that short term risk is similar to an index tracking stocks and shares ISA, as they're both only likely to see big losses if the economy takes a big turn for the worst. The difference with an index tracking ISA is that the ISA is likely to recover, whereas defaults under Ratesetter are lost.
If you're not sure about the term of investment, you should look into their liquidity / buy back options, it's got a pretty fair way of allowing you to retrospectively convert money from a high interest 5 year loan to a shorter term one if you need to pull money out early, with your profit being adjusted accordingly. Liquidity relies on new investment into the platform, which is not guaranteed. My feeling is that liquidity is going to be fine unless it all goes titsup.
Keep in mind that because you see such high returns compared to current FSCS protected schemes, you do not need to put a large fraction of your savings in there to make a big difference to the total income you get from savings.
I believe they offer borrowers a very good deal, both in rates and in penalty free early repayment. I am quite happy to participate in a scheme that's a good deal for borrowers and is taking business away from the high street banks. I've had enough of seeing their adverts for personal loans at 8.5% next to their current savers rate of 1.0%. Stick it to em!
I can't speak for other providers, but with Ratesetter, they do not pay tax on your interest, so if you don't currently do self assessment for your tax, you will need to start. It should take about half an hour to do SA if Ratesetter is the only reason you need to do it,
if you keep good records and don't loose your login details each year.
Post edited at 11:23