Yes, absolutely. Unless it's an error like "BBITANNIAR", which has occurred on a batch of coins, there will be no interest, because the error discovered is not well known and is indeed, unique to the finder. It has to have limited marketability before a collective interest is sparked. Witness the 2008 20p debacle for an example of collective interest sparked by a moderately high number of error coins of the same type. Incidentally, I actually got one in my change the other day, but as is always the sod's law case whenever I get something unusual, it's got a weird stain on it.