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@Object
Agreed that it can end up costly trying them all out. But it's the kind of thing which doesn't need to be done often. Surely a cyclefit type scheme would be able to give some pretty solid opinions?
I myself wasted the money on lot of different length cranks over the years and worked it all out through trial and error.
It's also worth noting that shorter cranks change the rotating position of your legs in relation to your seat tube so you may have to play around with different saddle positions, or even a new frames, to get it spot on.
Realistically it all comes down to intended use of the bike. For distances it really makes sense to get everything set up perfectly. For 10-15 miles across London you can probably ignore all advice and do whatever you like.