As long as you’re a UK resident who flew with an airline under the Montreal Convention, you’re eligible to make a compensation claim if there’s a case. If the airline you travelled with has an office in the UK, then this will also support your claim.
The first thing you should do when you’re back home from your holiday is get in touch with a Holiday Claims Solicitor. They’ll be able to assess your situation and let you know if you’ve got a strong case.