Hi bayley,
Can upgrade to extra legroom for £10, ask for the foward seats or the ones at doors two. Becarefull of the infamous row 11, some of the fleet have a different layout and row 11 is missing!!
I think row 10 is also extra legroom but I spend most of my time at the pointy end so please don't quote me.
The aircraft has 6 seats a row, 3 a side with an aile in the middle. They are lettered A.B,C and D,E,F with A and F being window seats. (I think!)
Try not to get down the back end either, some fits have 3 toilets fitted at the back 1/3 of the aircraft and on a long flight with a lot of pax, it can get a little wiffy down there.
Hope that helps, have a nice holiday!