Well, folks, I've already posted details of cast-iron wheels from Walsall Model Industries, along with possible prices, but like a lot of other things I've posted recently, that has been ignored. See -
https://www.gscalecentral.net/threads/sunday-17-february-2019.312600/
However.... 10mm to the foot and 1/32 scale really are different, as you'll quickly see if you put them side by side. A bit like the difference between 1/32 gauge 1 and Aristocraft and USA Trains 1/29th scale. 10mm to the foot is, of course, as near 1/30th scale as makes no real odds.
The difference in the US and Canada lies not with the model engineering scale of 1 1/2" to the foot - 1/8th scale in simple terms, but in the adoption of what was perceived to be the correct scale ratio of track gauge and scale.
7 1/4" track gives a scale of ~1:7.8" - pretty near 1/8th scale and easy to calculate as a result, ignoring the slight difference in true scale appearance. I'll let you figure out the difference for scaling stuff to run on 7 1.2" track.
US/Canadian model engineering scale for locomotives differ substantially from those of the rest of the world, and are aimed at making scaling easier by a simple rationalisation.
Their scales are 1/2", 3/4", 1" and 1.5" to the foot. For example, whereas in UK and most of the rest of the world, we run medium-sized locos on 5" gauge, in North America that is 4 3/4" gauge. I think that most of us here would be capable, with a pal or two, of lifting a 5" gauge Duchess out of a vehicle - about 100 lbs or so, but would rather not try the same deal with a Pennsy K4 at at least half as much again.