Mike, you've been more help than you realise.
Thanks for email address and webaddress. I sent an email to Dave filled with questions.
Coastairbrush carry all the accessories I've been struggling to locate and they ship internationally too.
I received some feedback about the Tamiya HG ranger over at armorama. Basically its an Iwata brush with a different brand and quality is the same. The guys who use it seem to love it so I suppose thats a positive sign.
Thanks again for your comments and time, much appreciated