Thanks again everyone.
I did wonder why he didn't want to burn it on a fire, possibly because he thought it was something that might be a bit nasty? That's what had me thinking it might have been Yew and I didn't have a clue as to what else it could be.
I'd previously seen a video where Laburnum was being turned and he said that precautions were needed due to it being poisonous/toxic, but I'd forgotten what the wood looked like.