Thomsons have upgraded all their long haul flights this winter so you will definitely have extra leg room, just not sure on the exact dimensions etc Kev.
We are flying with Thomsons to Goa in March so you can let us know what its like, thanks.

Hi Kev
for more info on Thomsons we have a thread here here
We also have a specific thread for Goa flights here. Hope that helps