PCW & PCs
Sir Alan was responsible for the real start in personal computing at home and work in the UK. Apple, CBM, etc. were popular with enthusiasts but when vicars, plumbers and wannabe authors could walk into Dixons, hand over £458.85 (VAT @ 15% then) and walk out with *one* box containing all they needed to discover the wonders of purposeful PC use, it was time to pay attention. Using 3" disks, which were cheap and rugged and CPM, leading to a great number of third party applications, made many people's lives better. Oh, as a salesman flogging this kit at the time, I can vouch for its reliability, too.
If that wasn't enough, he did it again with his first proper PCs. What spoiled their success was Seagate's sh**ty hard disks, which need parking if you as much as coughed within a foot of the base unit or you risked shredding the platters. Amstrad eventually got several £M compensation but it was too late by then.
As for all those picking on his flops, consider this dodgy - very dodgy - analogy:
Edison failed many times before coming up with a working lamp. Alan's hit to flop ratio is slightly better. (Told you it was dodgy.)
http://ezinearticles.com/?Thousands-of-Failures,-but-Thousands-of-Patents&id=20906 (out of respect for an infinitely greater achievement)
Paris because her keyboard must be clogged with lost false nails...