Definitely a good chance that it'll be marked up! However, bear in mind there is possibility that it *could* be graded a few marks down too (tho probs wont affect grade).
I would say go for a remark! i regret not checking English from 6 -> 7 and following up cs from 5 -> 6, esp since im doing a level cs (also regret other a-level/gcse related stuff, but eh)
edit: btw, its probably very likely to be marked up a few marks, and the 4 will be given, so defo try