In the UK these type of delivery drivers will be driving vans weighing under 3.5t. The restrictions on driving times only apply to vehicles above this weight.
Other drivers will be covered by the GB domestic regulations. There are maximum driving times listed in the domestic regulations.
The flowchart here tells us which rules apply:https://www.gov.uk/guidance/drivers-hours-goods-vehicles/int...
https://www.gov.uk/guidance/drivers-hours-goods-vehicles/2-g...
> In any working day the maximum amount of driving permitted is 10 hours. The daily driving limit applies to driving on and off the public road. Off-road driving for the purposes of agriculture, quarrying, forestry, building work or civil engineering counts as duty rather than driving time.