Double din fit
 

My dad currently has the symphony head unit but I have an alpine double din unit which I wondered if it would fit and if so what is involved. Would I need a facia adapter? I have a wiring adapter I think if the rover uses standard din connectors.

You will need a double din facia adaptor.
I believe Connects2 and Autoleads both make these.
Here is a link to one sold on Amazon.
http://www.amazon.co.uk/gp/aw/d/B005...AC_SX110_SY165
The Symphony head unit has standard iso connectors so you will be fine there.
You will need a steering wheel interface (swc) though if you wish to keep that function:xmas-smiley-018:
Do a google search for double din Rover 75 facias and steering wheel interfaces and you will find lots of suppliers of these.

I fitted a Alpine double din unit to mine

Purchase from autoleads pc99-x32 (stalk adapter) and a Alpine patch lead

And any Double Din facia that fits the Rover 75, plenty of these on the bay

MM

The Symphony has ISO connectors so a PC99-X04 adapter lead is needed with an Alpine patch lead. But I expect it has been sorted out by now.