And thats the key... I tried to sell N13NJA for about 2 years with no interest, in the end I just let it expire and never bothered renewing the retention certificate. My mate just sold his private plate which was just one letter, one number then his initials - like A1 ABC style and he got 120quid on ebay for it. Unless its really special the 2nd hand market in plates is quite poor atm.
Now thats a cracking idea actually!
Your right, it's the kind of thing that is worth a lot to somebody, and naff all to most others!
I might try googling that reg, good idea!