This is the latest list of affected operators from FlightRadar24 blog:
https://www.flightradar24.com/blog/a...irlines-crash/
The CAA statement:
https://www.caa.co.uk/News/Boeing-737-MAX-Aircraft/
The five 7M8 referred to in the CAA statement are all Tui, I believe, although obviously operators like DY were affected, with 18 in service. DY have now grounded the MAX anyway.