Actually Smudge' in my last firm, Monarch did the 'Heavy' hangar maintainance, but a little known company called BCT, made up & managed by a motley crew of ex BA, FCA, MON, TCK & TOM engineers who were the best maintainers I've seen in nearly 20 years of airline flying.
I don't think I EVER had to check the validity of an ADD because the aircraft were very, very well maintained.
If you are EASA compliant then that's it-you are EASA compliant, end of story.
Just because BCT weren't top dollar, it doesn't mean they were top drawer.
Cheers
Daddy!
