that eel pie exists is beyond me
Evidently many things are beyond you. I've eaten Eel Pie. It is a traditional dish. And provided a link to a recipe; one of many.
Nor does the firm you cited deliver eel pie
Looks like you didn't read much of the link. They make and sell Eel Pies. £7.95 each...
They do deliver jellied eel... don't ship them by mail....not a traditional pie and mash shop
Looks like you didn't (or are pretending not to) notice that there are two links. One is to a company on the coast that deliver Eel Pies. The other is to a very traditional (perhaps the best known) London Pie and Mash Shop. They sell jellied eels (you falsely claimed this was impossible) and stewed eels by mail order (no ships involved!) to any UK post code.
I'm happy to link to any number of companies that do much the same, however the thread is about Polish foods rather than your attempts to argue about another countries traditional cuisine (of which your knowledge is self-evidently lacking).
Your reading comprehension is non-existent.