Hi Wheel Nut I’d have gone with euromat’s “Belgian” guess for the nationality of the truck carrying the poly-wrapped bricks too.
Having a stab at the van with “Loler” written on the back, I’d say that it’s some kind of test engineer/technician who tests and re-certifies FLTs, cranes and other lifting equipment under “The Lifting Operations and Lifting Equipment Regulations 1998”
Great pics BTW.