Visa Expiry

Hi Guys,
Is it ittrue that if someone dont use there visit visa within 3 months of issue, it expires.
What to do if you want to travel after 3 months of date of issue of visit visa?
Many thanks

no it is not true, if the visa we're talking about is Tier1. Theoretically it is valid until the validity date.
However if you enter UK say about 2 years after the issue date for the first time, then the people at the customs can become a bit suspicious and question you conditions like your job and residency status.