Hello all, new poster on the forums though I've been lurking for a while!

I have BA27/28 LHR-HKG coming up in September which I think will be operated by a 777-300ER. Does anyone know where the IFE boxes are on this aircraft? I seem to remember them being quite chunky, and would rather book a seat with unimpeded legroom.

I'm currently in 23J and 22G.