The Oric Microdisc was a rare peripheral, rather than being built into a computer like with the Amstrads.

It was originally promised for the Oric-1 (with no details about what form it would take) but details were initially vague, with it being announced as a 3" drive only around the time of the release of the follow-up model (the Oric Atmos). It finally arrived on sale around a year after the Atmos, only a few months before Tangerine went out of business. I can't imagine many were actually sold in the UK, though some probably turned up in France where the Atmos was a bit more successful.

There's a bit of info at https://www.computinghistory.org.uk/det/31261/Oric-Microdisc... so it definitely did exist (unlike several other peripherals promised by Tangerine over the years!)