They went through a brief history of what he did on the news last night and before the Spectrum which was probably his best offering he also did pocket calculators (As already mentioned) but also a watch which was a flop.
At the end of the day he was perhaps seen as a slightly "madcap" inventor and many of his ideas flopped however i'm sure every inventor has a high failure rate but the focus tends to be on the things which achieve commercial success.
Other inventions such as the C5 were derided but what about if he invented it 5-10 years ago but an improved version using modern technology, with the move towards green transport etc and increased use of cycle lanes perhaps it could have take off.
Same with his lightweight foldable electric bike that could be taken on public transport, what a great idea for the modern world.
I'm thinking he was perhaps one of those visionary people with ideas ahead of the time he was living in
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