OK so I've now narrowed it down to the following. Needs to be light and suitable for summer riding only and under £100. Here are the options –
Specialised bg comp (£100)
Shimano M161 (£78)
Mavic Razor (£90)

Have just about decided on the Razors. Any final thoughts before I click and part with my cash?

http://www.rutlandcycling.com/24484/Specialized-Comp-MTB-Shoes—2008.html – £50 – I got these 2 years ago – Sill going strong

Have you tried them all on?

The Shimano tend to be narrow fitting – I wear Specialized BG sports due to their wider fitment

Have you tried them all on?

+1
Proper fit above looks / price all the way – you'll really feel it if they ain't right –

Signed – another flipper footed Spesh BG wearer… 🙂

I prefer Specialized to Shimano as I find Shimano's a bit narrow too

Mind yopu, my feet look like this