If you're a taxpayer, I'd opt for the best Cash ISA you can find. If you've already used up this year's allocation, building societies are currently offering a number of good interest deals with one and two year savings bonds.
As well as the previous site mentioned you can also check out www/moneysavingexpert.com
If you want a very low risk investment you should do mutual funds. Energy mutual funds have provided a good sector fund even during this worsening ecomony.