If you're stuck I heard that Evans are doing a trade in of any old bike (even a childs one) for about £30 off.
With that in mind I like the look of this one.
Jamis Ventura 21 lb weight is 9.5 kg.
Double butted light 7005 Aluminium (not the usual 6061)
Carbon forks, 9 speed at the back, 50/34 compact crank.
The 11-28T cassette on the back will give a lovely set of ratios.
I don't know if that's the best deal but I think it is spot on for being the right specification.
The Mavic rims might be good too.