Name printing on butterfly shi

[Sovah501st]

I live in the uk. Does anyone know where can I get my name printed on a Butterfly shirt that I already own? I’ve been to my local printer but they’ll only print on a shirt from them

 

[Tony's Table Tennis]

not sure about UK, but there should be many printing companies that offer this service.
tell them price isn't a problem
because the trouble of printing 1 shirt, I think most people would even bother with it.