Greetings and welcome to Flyertalk, welcome to the British Airways board,
barr21, it's great to see you here, please make yourself at home and it would be good to hear more from you.
Now though I know LGW very well, and Orlando is a place I go to regularly, nevertheless I've never flown between the two locations. So I'm not much use.
However I do know that Seatguru is worse than useless. We get so many queries here about the errors on it that I think it deserves the label as positively misleading. The BA information hasn't been updated in years, despite people sending in updates. Someone more qualified than me will confirm this, but I think that WT seat actually has a swing round mini TV screen, on a metal bar, which many find a better option than the back of seat TV. It does reduce the seat width a bit and is a bit awkward to position. Also the cot position will require a phone call to obtain, which with young children is something you can do. On the other hand there is always the risk of an aircraft substitution, there are other 777-200s with different layouts.
thebasource.com is a much better location for accurate information on seatplans:
http://www.thebasource.com/seatmaps/...0j24w219y.html