No. That route is currently flown by a 777-300. None of those have been refitted with the new seats yet.
The current situation regarding 777 refits is at
LGW & LHR selected 777s go 10-abreast (3-4-3) in Y 2018 onwards (all the 777-300s are the STB series which are in blue on that list).
FR24 currently has the operating aircraft listed as G-STBB.