VickersVicount
EZY had the South Wales Market happily using BRS. FR have a decent presence at BRS too so likely wouldn't want to dilute that. With Jet2 going to BRS and question marks over BRS expansion there likely wasn't room for Wizz and everyone to grow.
Wizz can use CWL as foothold into South Wales and even the Southwest market and start to compete with EZY and FR.
As for SSH its a risk as its always generally been a package holiday market but they have seen an opportunity as its only served by TUI in the area.