From people I've spoken to (some of which have their same holidays every year) they just aren't prepared to risk getting caught out by the government's dart board technique of imposing restrictions. They aren't bothered about getting pcr tests but they won't risk getting stuck in hotel quarantine. Considering most of the popular destinations are currently Amber it's too much a risk. If the government imposed say a 7 day notice period before imposing Red restrictions I think it would do wonders for the leisure travel industry.