Alfredo agreed.... Definitely NOT Loetz. If it is Czech, then it is in all likelyhood Kralik, with the thorned feet.
I also inquired with Alfredo about the English possibility, and his feeling that the piece is too "coarse" for English. His experience is that English pieces are more delicate...
I defer to those more well educated than I on this one..... I don't do a lot with English glass.