1966 Royal Mint patterns/specimens/proofs

[Mister T]

I saw in IAG's auction 98 that there were some specially struck 1966 London-struck coins (2c, 5c, 10c and 20c) for sale. I guess I missed the previous sales of these coins, but I the description says the 2c piece is probably not unique in private hands. I'm guessing that this is just a gut feel, which is probably true, but I don't remember any other London-struck 2c pieces coming up for sale besides this example. I know there are some London-struck 1966 50c pieces floating around (but no recent sales) and I have never heard of a London-struck 1966 1c piece in private hands either.