I do a lot of 3mm air gaming.
SA-2 are only done b:
Oddzial Ozmy (Fighting 15s is the UK stockist)
JTF (Pico Armor in the US)
AAA isn't done by anyone AFAIK. But you could use some of the WWII AAA without shields.
The link Nik sent you is your best bet as you are in the UK.
For Markers etc, I use the CinC SA-2s which are 6mm and they look ok IMHO.
http://anyonenotfinished.pbworks.com/Downtown-a...