Well I got a ELM-327 unit coming my way shortly, from what I have read, these are hit or miss, some work some don't, but ELM327 supports:
SAE J1850 PWM (41.6 kbaud)
SAE J1850 VPW (10.4 kbaud)
ISO 9141-2 (5 baud init, 10.4 kbaud)
ISO 14230-4 KWP (5 baud init, 10.4 kbaud)
ISO 14230-4 KWP (fast init, 10.4 kbaud)
ISO 15765-4 CAN (11 bit ID, 500 kbaud)
ISO 15765-4 CAN (29 bit ID, 500 kbaud)
ISO 15765-4 CAN (11 bit ID, 250 kbaud)
ISO 15765-4 CAN (29 bit ID, 250 kbaud)
Any idea what protocols the AGU and other mk4's support?
EDIT:
Reading Torque (Android) forums, bluetooth seems to work some UK cars, it does work on:
Audi RS6 (2003)
Leon Cupra R mk1 (2005)
Would be good if there was much more feedback on what cars it works, shame the torque forums have poor feedback and input, especially from the Devs as they just say OBD2 but not what protocols it supports.