Thanks for your replys guys!

I am not travelling alone but I will be the only driver so I'm not sure if booking in another name would be a good idea in my case...my rental will be 17th-30th May.

Good comment about wanting a bigger car lol! I have been looking at some of the excesses these companies charge and most are huge, 1000 euros not uncommon though to be fair the last time I rented a car in Scotland (from Thrifty) I think the excess was in the region of £600.

I think the avis excess is "only" £220 which seems fair enough but I am not 100% certain of this yet - perhaps an email enquiry would be in order soon.

Still considering whether I should prepay for the cheaper car(@ avis.co.uk) and then still have the option of having the larger car when I get there. The group E car is normally £406 reduced to £250 (was £259 a few days ago!) and the group G car was £515 reduced to £315. Big difference as you can see.