Poms can't help themselves. Of about a dozen shots of tape measures not one dimension is an even inch or even half an inch. I have never worked out the British fascination with 37/94ths.
I think it has to do with the class structure. The engineer works out the structural integrity required to support the load which comes to say 4 43/87" on his slide rule. The draftsman being a lesser mortal is terrified of the engineer and refrains from making the drawing 4 1/2" thereby consigning the pattern maker, construction line and mechanics for the next 30 years to a world of pain.
