Hi nathan!
Don't worry im sure many of us still watch airline...well i do anyway
With regards to your question the only which i can see on the website is this, which you have probably seen!
'be able to demonstrate that you have successfully completed secondary or high school education'
Off the top of my head this is 5GCSE's Grade A-C in Maths, English and a Science. I think it is two A levels also, although this seems to vary with each FTO.
Assuming you are looking to go intergrated, the three 'big boys' so to speak are FTE, flight training europe, CTC and OAA, oxford aviation. It is paramount you look around and do your research!