I parked my bike next to this caucus of a bike. Still firmly chained to the railing, but not much left of it.
When I leave my bike overnight, I use two locks. One a thick cable, the other a massively heavy motorbike chain. One through each wheel and both through the frame. The cable lock has been attacked but held. As far as I know an attempt on the motorbike chain has never been made. I don’t know of a way of getting through it, without oxy acetylene cutting gear!
Cable showing the cuts where Mr. Scrote attempted to cut through it.