Historical interest only, and probably only for Londoners, but I can remember them at another address before Valentine Place, only I can’t remember exactly where. Anyone else remember?
I think Martin started Silverprint in Wapping in the Docklands in East London. This would have been late 80s or early 90s. Certainly remember going there and having a long chat with him. Later they were off to the bigger premises in Valentine Place in Waterloo.
Not sure how relevant it is in this thread digging up and referencing the previous company details when he owned the company, as the Silverprint which has recently gone out of business was a very different company to the one Martin and Janice founded and subsequently sold several years ago. Over the years, (decades!) Martin has done so much for analogue photography, not only in running Silverprint, but in publishing several books, (I contributed to the one on Liquid Emulsion), and the excellent and recommended Silverprint Manual. Also importing some amazing products like Seagull Oriental and really supporting the community, especially us photographic printers. And after Silverprint, that was followed by being the main importer to the UK of Foma products.
Along with Process Supplies, and the previous owners of Ilford, (and then Harman), there were several get togethers organised each year for printers, usually connected to working on joint exhibitions and calendars and promoting Ilford and the two shops. Sometimes it was for the launch of a new paper which we would then test and giving feedback to Ilford / Harman. Great evenings bringing the printers together, and I think we all might have over-indulged at times with their hospitality and open bar tab!

Glad to say Process Supplies carried on this tradition. Wish Harman would!