Bit slow in replying on the thread I started - Thanks for replies/info.
The unit I fitted is a Pioneer MVH A210BT, it's a cheep and basic double-din touchscreen radio, no chance of it doing satnav but that aside it does all I want - analogue radio, bluetooth phone connection and could be connected to a reversing cam (but isn't). Fitted in haste before my holiday and without much research, I didn't want anything that took time to boot up (some Androids do apparently?), one of the things that sold it to me was it's physical mute button!
Most of these cars (Elgrands) have the factory option of hinged touchscreen on the dash fitted, when fitted the screen does all the heater controls, radio controls, satnav, reversing cam, even reports OBD problems... but in Japanese, cannot be changed to English and the satnav cannot be made to work anywhere except Japan! I prefer the dash heater controls with constant LED readout so no great loss besides the reversing cam. Ideally I'd like to keep the radio I have and fit a hinged screen from a scrapyard, connect it to a reversing cam and somehow get satnav working on it. Or I might just buy another Tomtom.