Southend EGMC is H24.
But that's about it. Cardiff EGFF is the only other one.
There are various ways to skin the cat if you want to progress to more advanced stuff ASAP, but it will take an imaginative instructor and more importantly a lot more cash.
A lot of people have done the FAA PPL+IR by flying around the USA with an instructor. This is possible here too (JAA PPL, or IR) but would cost similarly more, because the instructor is your "guest"
You will end up being a very good practically capable pilot - something you definitely will not be when you get your PPL.