Yes, it's costing the UK not much less than if they had bailed out the company and forced some restructuring. (Yes, that way lies the potential for moral hazard)
Which is to say that it is in fact costing the UK very much less than a bailout.
But honestly I don't know: I don't think there's an easy calculation here, and probably it's best for a country to take these things on a case by case basis. I think it's reasonable to not bail out TC, but I also think the alternative could have a rational basis as well.
So no, it’simply not true that any Greek hotel will be left out of pocket from this.
If there were 600,000 TC tourists out in the beginning of this week, there is capacity for 600,000 tourists in 3 weeks, in 6 weeks and so on. Winter might always be a bit less busy, but it's obvious that economies in the holiday countries will lose a lot for many months to come. Much more than Britain or any of those companies where the tourists come from.
I'm not sure what the long term costs of "moral hazard" would be, but I've also never bought it as the bogey man some make it out to be. I simply don't think that many executives would steer their company in a direction that is more likely to lead to insolvency just because it might get bailed out. Not when it also means they lose their job in disgrace along with a lot less in compensation than they would have made if the company stayed solvent.