TUI survived the volcano thing better because they have lots of non-UK operations, especially in Germany, which served routes not effected by the volcano.
In fact there German operations have survived better in General - like the German economy.
A quick reminder to everyone - if you book a holiday, USE A CREDIT CARD. I know you pay a credit card fee, but if anything goes wrong you can be sure of getting your money back.
Also, don't book with Thomas Cook, they're rubbish...
Or alternatively (and you do a lot of travelling) buy an inclusive annual insurance policy. All persons going abroad should have insurance anyway. This would usually contain a section on failure of a travel operator.
Cover from a short break to Brighton to walking in the Andes..