It's noticably spicier than Colman's, very similar to wasabi in strength.
The only reason that I use Colmans is that I like to cook, and if you add Colmans mustard to a cheese source it will enhance the flavour of the cheese, where unfortunately Polish cheeses are sadly lacking in taste and strength.
I know that it's not illegal as a Polish friend of mine brought some back from England
This is strange because she was given a leaflet with the details on those that were banned, which included these products.