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easier to travel with
The answer is going to depend to a large extent on what you mean by this.
he's a British engineer
If Britishness means more to him than engineering, he's not really an engineer :)
light and wide gearing range are key
Moultons are not light, the same money could knock 2kg off if you spent it on a carbon 700C bike. The gear range on the stock ones is about 4:1, which can be replicated with SRAM 1×11 road groups or exceeded with a common 2×11 compact with a mid-cage RD. Tyre choice is limited for small wheels, and big ones roll better over bumps, which can be a particularly significant issue for old bones.
Moultons. Any good, or overhyped?
Thinking of trying to organise a whiparound for my dad to get him a decent new bike that's a bit lighter and easier to travel with than his Dawes Galaxy tank. He's getting on, so light and wide gearing range are key. He'd much rather a bit of British engineering (he's a British engineer) than something carbon fibre that makes him feel old and unworthy. So I thought Moulton. Am I wrong?