The average UK gardening truck is something like this: https://www.ford.co.uk/vans-and-pickups/transit-chassis-cab or the ubiquitous Hilux. The "I need an unreasonably large vehicle to take my kids to school" niche is filled by Land Rover, which are still slightly smaller than the F150.
US-style pickups exist mostly because of weird tax and emissions rules which should be harmonized with cars.