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The outlay for those cranks seems pretty high, out of my price range almost definitely! I think swapping down to a 34 small ring if possible should do the job (if it needs doing at all).
@plexarice thanks, that's really encouraging! In any case I'm hoping to do a couple weekend mini-tours into the Chilterns and possibly a trip up to Manchester by way of preparation. My concerns with gearing are more with tackling some of the climbs the Rockies in Canada have to offer, but I reckon it should be fine...
Famous last words.
yoshy-
I left the coast quite a lot a did several peaks over 5000ft - still no problems with that gearing, so I wouldn't worry to much. The only issue I found was if you're planning to go off road which in that part of the world you can (and should!) alot when it's nicer to spin a gear. But with a 32t at the back you'll be fine.
plxarc
In your case I would sell the original chainset and go for a Compact Plus solution, like a Sugino, with 46/30 or 44/28 chainrings.