The Brompton isn't really an alternative to the Dahon. As you know, folding bikes compromise a few factors - folded size, ease of fold, ride quality, cheapness and crapness of design. The B is quite small when folded, folds in 15 seconds (no, really) - it is only because it is very well designed that the ride quality is acceptable.
It's not the same job as "slow to fold, rides something like a non-folding bike".
England has a really unusual propensity to short sharp climbs compared to most places (Scotland is much more "normal" with long slow ascents) and that means short fast descents. I would expect to get to around 35mph at least once on any reasonable length country ride - if you ride fixed over here, you just have to be able to do 120rpm and brake a bit...
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It's not the same job as "slow to fold, rides something like a non-folding bike".
England has a really unusual propensity to short sharp climbs compared to most places (Scotland is much more "normal" with long slow ascents) and that means short fast descents. I would expect to get to around 35mph at least once on any reasonable length country ride - if you ride fixed over here, you just have to be able to do 120rpm and brake a bit...