We fly LGW to TPA towards the end of May in WT and the seat selection suggests there are 216Y in 3x3x3 from row 15 to 39. If row 40 has been ommitted for any reason then this would tally with a 3 class 777 layout. The guide does seem to show lots of toilets though, more than on the seat guides I have seen on thebasource for example.

On our way home from TPA to LGW the first weekend in June the WT+ layout is odd. It is 32W seats starting with 4 in Row 10 (AB & JK) then three full rows of 8 (rows 11, 12 and 13) then row 14 is 4 seats (DEFG). This does not match any current seat layout I can find (BA.com, seatguru or thebasource) or the proposed new layout when it goes to 10 across. Also our dates and days aren't when BA is supposed to be putting this new layout on the TPA route.