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There is a case to keep issuing stamps showing Queen Victoria. However, neither Queen victoria, nor Queen Elizabeth II are a current symbol of the UK.
Not really a case for that. Victoria was the subject of her stamp's designs, which featured her portrait.
The sillhouette of QEII was used on pictorials, where she was not the subject of the design, as a device to signify the issuing country. That device wasn't really a portrait or a depiction of her as a person, especially not when she got older, but was used regardless because of what it stood for. Any symbol would do instead of a country name. Consistency might be better than bothering with who the sillhouette was originally based on.