from your post im not entirely sure what gives you this read to be 4bet calling, i mean those type of reads need to be clearer cut imo. that said if you do think he has3b you light with 40bb stick it in his eye
with the blinds + antes + 2500 + 2500 you already have a sizeable pot and a significant portion of your stack in the pot preflop. a shove would be good here preflop imo
nice to see the starting stacks increased for next year, will there still be a £1500 London leg next year and if so how many starting chips will this tourney carry?