I think that's from where I bought my very first sat system in 1991!
I "jumped straight in" with an NEC 5000 steerable system, including the demo-system dish and mount that was bolted to the outside front wall because I figured that it should be correctly set up in terms of elevation & declination, and so all I would have to do would be to get it pointed in the right direction when I got it home. OTOH I didn't then make it easy for myself by deciding to mount it on top of the front bedroom bay window and thus had to run all the cables through the attic and down to the downstairs rear lounge, but I eventually did all that and the system then worked well for quite a few years.
As for other, now defunct, sat shops, there was one in Croydon (also called Spectrum or something like that??) from which I bought my first Sky Digital system in 1998 (and then quite a few "pirate" cards for various decoders to attach to the receivers which replaced the NEC!)