Auntieflo
I seem to remember seeing a programme about Taxi drivers, in London, and dotted about were little green painted huts? that the drivers could use.
Delivery drivers could do with a network of such facilities, but who would finance it?
... it could / should be financed jointly by those that employ them, or for whom they deliver?
Of course, it would eat into their profits, so they'd pass the cost on to the customer.
But it is unsafe, and unsanitary, for them to use plastic bags and hedgerows, and, I am informed by a Tesco driver - they are not supposed to request to use their customers' toilets. For legal reasons.