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@clubman
Allow for couple of spares - as a kid I must have smashed a few dozen of them before I got the knack
(maybe I was a slow learner).
You will probably (but not certainly) find that your new cotter needs filing to get enough thread to fit the retaining nut and its washer. Do not try to force it with a hammer.
Support the crank when you do any serious hammering - once you've got it to fit you will need to use a little force to 'settle' the pin. I rest the crank on an old vice supported on bricks - the support is necessary to avoid risk of damage to the BB bearing. I recommend checking for tightness after a first ride
Crank forward, nut upwards is the English practice. Continentals usually fit them the other way, but I don't think this is a big enough issue to justify Brexit.
I am aware of two sizes: English and continental, the continental being slightly smaller in diameter. I had never noticed a difference in length. I think the 8.5 mm must refer to the diameter, not the length. Your Durax cranks may need the smaller size, the Williams will take the larger size.
I expect a cotter pin to cost 6d. but, as you know, I live in the past. I do realise that 50p would be the rough equivalent now. No old established bike shops near you?