I had a few of them after buying them up at car boot sales, then ended up ditching the whole lot when moving to a smaller house as I just didnt have the room :/
I had Spectrum 48K, Spectrum+, Spectrum 128, +2 and +3 machines with various peripherals including interface 1 and 2, another interface I had for the 48K plugged into the expansion port and added a 3.5" drive to the machine as well as additional ports, parallel etc. Literally 100s of tapes and some game cartridges that plugged into the top of interface 2 i think it was. I deeply regret parting with them now, as well as my C64 and Amiga collection :/ I never seem to learn lol.