My dad found this old advert for the Osbourne I... at only £1250 + Vat (and with a free 12 Inch amber for a limited time), this is The One To pickup... or not as they were never popular. Weighing in at "below 24lb" (10 Kilos!) this was a proper computer running CPM the anscestor from which DOS was cloned. It's interesting as this was before the 8 bit wars had really kicked off in the U.K. with well known computers from Spectrum and Commodore, Amstrad and Acorn.
[EDIT - Add Flickr link]