Yes, I had decided not to bolt it underneath when I went to buy the drawers - it is quite weighty in itself (
before putting anything in it!)
So I decided to by two of them
so I can just stand them underneath the bench (or to one side) one on top of the other.
I haven't got the room to put them on the bench itself unfortunately.
I'm now searching for some plastic parts trays that will fit nicely into each drawer to make the parts easy to find (and to quickly see if I have to restock anything too).
The drawers do not have a stopper on them which will be an advantage as I can pull the drawer right out and place it on top the find what I am after, rather than trying to bend right down to the lower drawers and not having enough light to see by.
Very happy with the purchase (and all thanks to Wilfred
)