Im in a very privledged position as all the schools i applied to accepted me. Problem is I never expected this as I applied very very late and was expecting to take the least prestigious school, but now have a nice, but confusing choice to make.

I choose only UK school due to cost consideration and have been accepted by Manchester Business school, warwick and Birmingham. (Aston was the safe bet which i will not consider now).

Manchester is the best rated, however it is 18 months and involves staying away from home.. an added cost i dont need to take seeing i can stay at home and study the 12 month course at with the very rated Warwick or Birmingham.

Warwick is a very highly rated school, and Birmingham although recognised is not as highly rated (though in top 100)

Warwick will work me hard no doubt ... but Birmingham place a lot of focus on student satisfaction and ensuring students enjoy their study...

So the choice is hard work at a better rated uni (which is a 40 min car drive away) or a more local uni who assure me I will work hard but also play hard...

your advice please ;)

It may be a stupid question, but have you visited the schools?

It is a good idea to visit the schools, especially since you seem to be close by.
Besides, you should more precisely at what you want to do with you MBA.
Do you need an MBA which is a "brand", that's the case if you intend to look for a job on the international job market? Then go for the better ranked, warwick, your MBA will impress international employers.
If you already know where you will work, and it's more for knowlegde and your qualification, there is an argument in favour of Birmingham, as you describe it.