Gooster, Taytay
I've been chatting to a friend of Chalky (empties slots in SE Essex) and he's said that there is a DOND board sequence that, when the machine's 'ready' will drop the Cashpot or Megastreak (guaranteed £100 with poss. repeat).
Your sequence of 4, 6, 9, 10 and 4, 6, 9, 12 is valid on a few DONDS with a *slight* tweak !
Empties slots?
Ah he must work for a supplier then, collecting all the takings?