I'm no expert on coin errors but it looks like Machine Doubling of some kind to me.
The 1992 10p has a huge mintage, as vast numbers were required to replace the older, larger 10p's. There are several varieties and, with such a large mintage, it would be logical to expect a fair number of error coins for that year.
Although things do seem to be changing a bit, British collectors generally are not as interested in errors and varieties as US collectors. Most British collectors probably have a single 1992 10p coin in their albums, or have two representing the distinctive square and wire rim types.
Maybe someone else on the Forum will get back to you!
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