On Tue, 03 Mar 2015 20:34:29 +0000, Bill Wright wrote:

I have a lot of spanners from my dad's workshop. Some of them are so big
I wonder if he used to work for Brunel.

A few years ago, I had to buy a couple of 50mm spanners, to undo some
large and esoteric suspension nuts. A couple of days ago, my neighbour
needed to borrow something to fit a non-return valve to his septic tank
plumbing. Guess what size he needed...?