Don't forget to factor in all the additional costs of travelling, accommodation, meals out etc. Potentially a rate such as £45 could go dramatically up when including such things and make staying at home better.
Why not take a look into buying a share in an aircraft? If you look around enough you'll find some very good deals - although of course there are risks to having shares too. There are some no equity groups about, where you just pay a monthly fee/lower hourly rate. If you search around these forums there's a fair bit of info.
Also I recall at least one individual/company on here who will hire out a 152 at a fairly decent dry rate for you to build hours on.