Hi Gav,
Sorry to derail things, but Richard the owner of Retro Wheels retired to the country about 2 years ago.
I am led to believe he sold all the stock etc to Tempe Tyres - see thread below.
http://www.viczcar.com/forum/topic/11712-simmons-wheels-repairs/
Neales Wheels in Sydney can also provide repairs etc to Simmons rims but I have never dealt with them so can't comment as to the quality of their work.
Cheers
PB