Wouldn't worry to much about the UK side, the slight dip is FR cutting the most capacity (daa row) from there, they were flogging huge amounts of cheap seats in recent years. Visitors have dropped but traffic has not declined as much.
Transit is more heavily from US to UK and Europe.
EI will likely grow T/A by 10-15% next year and I'm sure they will be a lift in short haul as well but much more moderate.