I watched an episode of Storage Hunters UK with him in to see what it was like.
First of all he was dressed like some overgrown, malevolent toddler in black jumper and white dungarees.
In the first ten minutes, the V/O guy called him a "Booming irritant."
In the same ten minutes, one of the other hunters actually went for him. Proper went for him. It took some of the others to try and hold him back from getting his hands on HD.
Just before the break, the 'host' (if you like) Sean - the same guy who does the US one - got so irritated by his mental actions on one auction he sent him to the back of the hallway.
After the break, Sean had appeared to finally lose patience with him and expressed a very real desire to take a baseball bat to heavy's head.
On one of his bids , he gave it as: "1,000 ninja, Jedi, Kryptonite, Batcave BOOOOM!!" While standing like an indignant toddler, legs apart, fists clenched by his thighs.
The others just looked irritated, fed up and disgusted with him.
So that was Heavy D at his 'day job'...