In reply to PPP:
this is a good list to choose from. I have
WC Zephyros (different versions, e.g. I like Zephyros 2 XL Lite - 1.79kg, £250, or Zephyros 2 Lite, 1.4kg / £200)
Terra Nova Laser Comp 2 (1.25kg, £350)
Force Ten Helium (1.43kg, £270)
Vaude Power Lizard (~1kg, £320)
Seedhouse looks great but I can't find a retailer based in the UK.
thanks for all the suggestions, it'll be a tough choice now!
P