Question: what to do with 5k?
Answer: Put it into an Instant Access Cash ISA. These tend to return around 1.75% pa so you would get an annual return of £87.50. ... 
Lock it Away in a Fixed-Rate Bond for 5 Years. ... 
Invest in Mutual Funds. ... 
Actively Invest your Capital. ... 
Lend through Peer to Peer Lending. ... 
Buy Some Land. ... 
Buy a Website. ... 
Put a 5% Deposit on a Mortgage.