For a short period a savings account yes - though choose a high interest one rather than a standard one. Doesn't need to be a notice one - you get little if anything extra for having to give that 30 days notice to withdraw.
If you are not otherwise using your ISA allowance shove �3k in one of those and avoid a bit of tax.
Depends how you define "a short period". If it's just a matter of months I think the highest rate savings account you can find would be the best bet. If it's for over a year, you might want to consider putting the first �3000 of it into a cash ISA. which is the annual limit. That amount will earn interest free of tax and you'll still be able to cash it in at any time.