I have a UK work visa and have been travelling in and through London several times. On two of these times, my visa was stamped in London, which usually happens when going in or through many airports. However, someone mentioned that the stamp is a type of visitor visa, and that at law, any new visa cancels previous visas.
I can only think that the airport staff didn't know or see that I had the work visa.
Is my work visa still valid or as it been cancelled by the visitor stamp?
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