Nice to read you, Keith [
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The spare is machined specifically to allow both front and rear use.
Not only are the outsides differing between front and rear rim, but also the stubs dimensions. The front rim's inner fits the rear stub but not the other way around.
You are damn right in your statement about the diff. So spare can really only be used to get you to the neerest garage. Should leave the spare at home (as some of my friends already do) and offer more boot space to the lady [
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Yes the larger wheel also fits into the boot.
These tyres are not found on the shelf[
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Switching to Bristol power might be a solution [
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Cheers
Constant