>>492104Rab Ascent 500 can be had from GoOutdoors for about £170. Buy a discount card (£5) and then e-mail them saying you'd like to accept their price guarantee as Trekkit currently has the Rab Ascent for sale at £187, which is lower than GoOutdoors' price of £193; they'll beat the lower price by, IIRC, 10% which takes it down to £168.30. 3 season bag, weighs 1060g, comfort rating of about -5*C.
GO Price Guarantee:
http://www.gooutdoors.co.uk/price-guaranteeGO Rab Ascent 500:
http://www.gooutdoors.co.uk//rab-ascent-500-sleeping-bag-p292426Trekkit Rab Ascent 500:
http://www.trekitt.co.uk/6897/products/rab-ascent-500-sleeping-bag.aspxGo Outdoors also have the Rab Ignition 3 down at £60 right now (+£5 discount card) which is a pretty good deal. 1350g, comfortable to 2*C. Or the Ignition 4 for £122.99 from OutdoorKitl; 1635g, -7*C comfort.
CapitalOutdoors allegedly have the Kelty SB20 (A slightly better bag) for sale for £170.36 but I can't see it on their website. It's on Amazon for £214.93 (I own one of these and I love it).
You could get a Kelty Cosmic Down 0 (1650g, comfortable down to -18*C) for £193.55 on Amazon. (Or an extra £7 for the long version, if you're tall).
An alternative is the Kelty Cosmic Down 20 Women's for £142.71 on Amazon which weighs 1150g but won't really be a viable option if you're taller than 5'8" or so (Height seems to be the only real difference between men's and women's sleeping bags, at least in this price range).
Summary:
Rab Ascent 500: £168.30 from GoOutdoors (1060g, 1*C Comfort)
Rab Ignition 3: £60 from GoOutdoors (1350g, 2*C comfort)
Rab Ignition 4: £122.99 from OutdoorKit (1635g, -7*C comfort)
Kelty SB20: £214.93 from Amazon (920g, -7*C comfort)
Kelty Cosmic Down 0: £193.55 from Amazon (1700g, -18*C comfort)
Kelty Cosmic Down 20: £142.71 from Amazon (1150g, 0*C comfort)