EPROM Services were based in Leeds and supplied the following for the Sinclair QL:
EPROM Services Printer Adaptor A centronics printer interface
Sinclair QL EPROM Cartridge - unusually supported two EPROMs.
Plus various software supplied on EPROM cartridge:
EPROM Services Basic 1
EPROM Services Graphics
EPROM Services Multitasking
EPROM Services Utilities