Koja, thank you - exactly the information I was wondering about! The "internationally famous" store is FotoSkoda of course, but I am more interested in materials than hardware so Befoto sounds great. Most of the more esoteric Foma stuff is available here, but frequently with four weeks order time and similar prices to Ilford, or higher.
Surprisingly, there is a direct train to Prague from a town just 15 minutes from me. Now, I just have to wonder if it will be raining . . .
I'll just update this thread to say thank you to the several APUG members who PM'd me generously offering help in obtaining this paper.
Through the good offices of one of them, I now have a small stock of 200 sheets ... well, after this evening, 197 to be precise ... :)