Marmot Mica Waterproof Jacket.
Marmot have their own technology that's in direct competition with Gore-tex and eVent. This jacket is v light at 200g, yet clams to be exceptionly breathable, on a par with eVent.
I've bought one, but yet to test it out (though review are very positive).
Retails at £100. Go Oudoors at £90, will price match plus 10% (cardholders), against Webtogs http://www.webtogs.co.uk/Marmot_Mica_Jacket_101024.html
at £89.99 delivered (1p less!) for £80.99.
I bought in-store, so I'd be interested if you can get Go Oudoors to match the delivered cost online, ie £80.99 delivered. .