Rod is quite right, but be aware that the current rules don't allow you to hire a microlight. Getting some dual won't be a problem, but to get much flying in you'll need to buy one, or at least a share (a lot of clubs run big cheap syndicates).
I run my own 2-seater at about £20/hr, but in a club syndicate expect to pay around £30/hr wet.
I am told that you can count 100hrs of microlight time towards an ATPL.
G