There's a couple of guys on Strava covering Chelmsford looks like they are doing around 80 km over an 8 hour day. Robinsons Chip Shop on Moulsham seems a very popular user of them - almost always 3 BSO leaning outside awaiting orders.
I find it really interesting the contrast in bikes used by Deliveroo/justeat/uber eats/Thuisbezorged riders in .NL and .UK.
In .UK outside the McDonalds of Canterbury there is a hodgepodge of BSO's, mountain bikes, road bikes, and maybe the odd fixie. But here in .NL, most of the bikes are branded Thuisbezorged or Deliveroo, usually a big hulking city bike, increasingly a number of E-assist bikes. They are all designed to have a box fitted front and rear, with simple but effective locking.
It did make me wonder, for those relying on a bike to feed themselves and keep a roof over their head, surely you'd pick a steed for it's reliability? and ease of maintenance...
J