Hi There,
Depends on how much of a risk taker you are...
Risk Options:-
Stocks, Shares, Investment Bonds, Company Bonds, Capital Lending, Start-up Investments, Hedge Funds (For �25K I doubt it..but worth a shot), Property.
Non Risk Options:-
Fixed Rate Savings, Savings Bonds, ISA's, TESSA's, Trackers
As it goes without saying the higher the RISK the bigger the Return on Investment. If you are looking towards buying a property for yourself and the likes then I would say a savings bond that way you can get at it before the maturity and you may be need it for the down payment of a property.