Is British Transit Visa date specific?

atmaramji

Registered Users (C)
My Mother in Law arrived in the US on a tourist B1, but it was single entry.
As result, she needs a Brit transit visa to return visa London.
While entering the form for the transit visa, they ask for return dates.

My question is, is the transit visa date specific .i.e. is it only valid for the date that was written in the application.

What if the date has to be delayed by a few weeks?
 
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