I just got a response from Barry:
"All I can say is that I have been re-locating the casting to Thailand and that it is all taking longer than expected.
However I expect to have some stock fairly soon and will keep Wabforum members updated asap
thanks very much for your interest, If you are in the UK ,I expect to have some stock with me at the bovington tank museum show on the 6/7th July
All the best
Barry"