Looks like a legit cargo bike with some mods
Maybe at one point stolen and rattlecanned?
It's a modded Cangoo, see lots of them around here in Belgium. Looked at one second hand a long time ago because it was so cheap. £700 seems steep, they go between €300 and €750 second hand unmodded over here.
@MCamb started
London Fixed Gear and Single-Speed is a community of fixed gear and single-speed cyclists.
pdlouche
LeMesjeu
@MCamb
Looks like a legit cargo bike with some mods