My local shop is a Waitrose, and quite often I see 10/15 or so trolleys in the rack have handles that say ‘on loan from trolly services’ or something. I wonder

My local shop is a Waitrose, and quite often I see 10/15 or so trolleys in the rack have handles that say ‘on loan from trolly services’ or something. I wonder if this is because some are out on repair.