Does any one use one to get around?

I don't drive, and public transport costs in Exeter are ridiculous, so I wondered about getting a trailer and a seat to go on my bike.

Would this be OK? I've seen quite a few parents around here do it, and we have a really good (quite a lot off road) cycle network.

i would assume that aslong as you do routine safety checks on bike, seat and trailer and document them aswell as an initial risk assesment you should be ok but id maybe check your public liability insurance covered you ?