I'm from Pakistan and I applied for a UK visitor visa for a company trip that got cancelled. However, my visa application was successful and I now have a valid 6-month visit visa to the United Kingdom. Now I hear from a bunch of people that if you don't travel on a visitor visa to the UK and it expires, your chances of ever getting a visa to the UK again are almost nonexistent. I obviously cannot find any such thing on any official source. Can anybody here share what they know on whether that's actually the case or not?