I've added the ninth variant to the expanding list of 777 types, the 77S, to the wiki. This type is frequently plies the LGW-LAS amongst other routes >10 hours.
Type 77S (777-200ER, G-YMMx)
Refurbished three class: 32J 48W 252M
The seat map above is still a work in progress. The cabin layouts correlate to BA's seat diagrams but the toilet arrangements aft of the Club World cabin is subject to verification. If anyone is able to review the map and confirm, I'd appreciate your help.