The current models are much fancier but until 2019 they were using various variations of the old Alvis Wheelbarrow, which dated all the way back to 1972!

https://www.rafmuseum.org.uk/research/collections/remotec-wh...

They were a fairly common sight on the streets of Belfast in the 1980s/90s, where carrying out controlled explosions on unattended vehicles proved to be a remarkably effective deterrent against illegal parking...