By the way you are right about glofish being illegal in the UK
"A license from Defra is required to legally sell or house genetically modified organisms in the UK. Defra tells us that no licences have been issued in the EU, or the UK. As a result, any such fish on sale in the UK at present are highly likely to be illegal. While we do not have any real issues with genetically modified organisms (there are few, if any, significant welfare issues) we would prefer not to see such fish sold."
"A license from Defra is required to legally sell or house genetically modified organisms in the UK. Defra tells us that no licences have been issued in the EU, or the UK. As a result, any such fish on sale in the UK at present are highly likely to be illegal. While we do not have any real issues with genetically modified organisms (there are few, if any, significant welfare issues) we would prefer not to see such fish sold."