Best investment types with quick withdraw options?

[Kiwi79]

Due to bailing out on a house a few months back I have deposit money split between two current accounts and a few ISAs.

We are likely to buy in maybe 4mth+ time as the otehr half is now gainfully employed. What would be a good investment/place to put the money where I can still have quick access but maybe get better return than current low low interest rates.

Any thoughts appreciated.

Thanks

[Kiwi79]

Thanks for the suggestions chaps, it is a case of weighting up hassle factor vs interest gained. Some good suggestions for me to check out.