What's the best way to fuck with a tradie on builders tea break

Got a flat TV and my boyfriend is just super proud of it and really wants to mount it on the wall. He's just an all-around handy guy and really has no problem with doing most things on his own. So he can relent and hire someone to hang the TV for him, and the appointment is today. <br><br>And he's British, which means he 100% wants to give them a cup of tea. <br>I know they're Brits and they're going to refuse several times before they acquiesce, but I think it would be really funny to piss off a tradie.