Well, I was desperate to get out on it but I don't have a battery for it yet. So I phoned the local non-emergency number and asked them if an under 14 yr old is allowed to ride a C5 on the road without a battery. They didn't know but said they would call back, about 30mins later I got a call saying that it is legal as long as I don't use battery power before I'm 14.
I did about 7 miles on it today, everyone loves it, it gets loads of thumbs up from people, and I've had some people even asking me if they could have a go. I may ride it to school tomorrow.