I was over there last week and both ways had G-VIIY which is one of the ex Gatwick 2019 refurbished 777-200ER with the old club seats and 14F cabin. I’d been tracking 226 and 227 for a while and probably 8 or 9 days in 10 it was one of G-VIIW , G-VIIV or G-VIIY so the chances are it’ll be the old seats.
Whatever you get have an enjoyable flight.