Shove 3k in a Cash ISA you wont pay tax on it, can chuck a further 3k in in April. Dunno if your married or with partner etc but if so thats £12k taken care of! Accesable when ever you need it. Everyone should have an ISA for savings!!!
Deals vary so be sure to see who has the best deal on offer!

ON the remainder remember to check whether interest is paid monthly or yearly.....suppose it all depends how long you are prepaired to tie your cash up for if at all as to whats best for you!

As a general rule of thumb an IFA will recomend that you have 3times your monthly expenditure within easy access, the remainder all depends on your future asperations.

HTH