You have my sympathies tony, I had alot of tools taken from my van between jobs whilst gettign a sandwich.
as someone who works in construction its understandable to say its a good chance it was foriegners. I presume he was talking about our eastern european friends. Some are fine and act like any other civilised person, do a decent ammount of work, to a high standard. But sadly these ones are forgot about in favour of the ones who do steal alot of tools, there have been a few caught on the sight i work on. But they also think its acceptable to piss on the floors, use the brand new, and not connected toilets, and cover the fittings on sight with paint, filler, etc. Oh and they seem to have a love for dodgy trance music 🙁