Having sold Sinclair to Amstrad, Clive Sinclair went on and led Cambridge Computer to the production of the rather brilliant Z88; a highly portable, Z80-based computer with a built-in screen, that could handle spreadsheets, word processing, your appointments and all sorts of other applications while also providing with a handy version of BASIC. The portable micro, essentially an early and powerful-for-the-day PDA, was only modestly successful, but remains both highly usable and interesting to this day.
Also, a boxed Cambridge Computer Z88 is currently being auctioned off over at eBay. It has been tested (and is working) and comes with its manual. The seller's shipping to Europe, United States, Australia and Canada.