Thanks for all who contributed to this thread - Enabled me to make an informed decision.
I bought an ex demo 1.5 Jazz Sport Navi (manual), having had a Civic 1.8 SE Plus, and I'm loving it.
Enquired the price of a space saver and was quoted £235 fitted at one dealer, and £280 at another.
After reading the info on this forum I emailed Cox's for their prices, and was quoted:-
a/ £302.25 for the spacesaver and all the attachments, foam etc
b/ £155.60 for a full sized alloy with Bridgestone Tyre
c/ £194.82 for alloy, tyre, jack and wrench
All the above with free delivery.
I went for option b as I already have a jack and wrench from the Civic.
Fits in the boot lovely. Bit of hardboard and polystyrene packing and the boot floor is stable.
Hope I never have to use the wheel, but it gives a better peace of mind than the puncture repair kit!
https://www.coxmotorparts.co.uk/honda-shop/genuine-honda-jazz-full-size-alloy-spare-wheel-tyre-2016/Hope this helps anyone that's thinking of a spare wheel.