IIRC Ilford still have the capability of coating glass plates for Nuclear chemistry. IDK if this has to be a special order or wether they release product into the chemical / nuclear supply chain and remake as appropriate.
Not a clue, however, I'm sure mr Galley would fill us in with the details if needed.
Looking at your website, you certainly have got some good results with HP5/FP4/Pan F
The distributor of the plates is:
Distributed out of :
400 Valley Road
Warrington, PA 18976
(800) 523-2575 or (215) 343-6484
(800) 343-3291 or (215) 343-0214 fax
Polysciences Europe GmbH
D-69214 Eppelheim, Germany
+(49) 6221-764620 fax