Manx2 and Citywing have had a decade to get things right. They've continued to get it wrong and it is only fair that they be shut down.
Citywing hasn't been 'shut down'. There was no action taken against them as they were operating perfectly legally.
Interestingly, according to the local Czech press the Czech CAA ( a member of EASA ) has said that it is not investigating Van Air nor has it suspended its AOC; they say they have been in contact with the UK CAA but it is the latter that instigated the 'grounding' and is conducting investigation:
Stroje brněnských aerolinek v Británii dolétaly. Po problematickém přistání - iDNES.cz ( machine translation ):
A spokesman for the Czech Office, however, rejects this information. "We are in contact with the British aviation authority which started and solves it. We strive for synergies, but rather it concerns the reporting of information and consultation, otherwise, we're interested in it very little.
Unfortunately as was discovered by airlines during the Icelandic ash event a few years ago, one cannot sue the UK CAA to recover losses incurred by their actions. They're basically untouchable and unaccountable. And this is a perfect example of what that enables; they can throw around some vague statements about safety concerns, send a small airline home, cause a travel provider to run up huge expenses and go bust and then... do nothing. They'll let it all drop, quietly. Job done for the Campaign Against Aviation.