From what I've seen it can be cheaper to get JR kit posted from the US than buy from Moss but I've got some stuff to return so the credit from that makes up for it.
I've looked into the cold intake and was thinking of either copying Trackdog's intake with components from demontweeks or fabricating something similar to this next winter utilising a vented headlight lid and the JR filter:
http://www.mymiata.paladinmicro.com/MiataJRSC.htm
I wouldn't use air source though, his car is USA LHD so he doesn't have the wiper motor on that side (or the danger of a Q-Plate for cutting the monocoque).
By the way, thank you everyone for the support and advice on my first proper posts. 
J