Andy9

I’ve driven all over the south of England with it working perfectly. The original radio had a very average sound but now it’s from the phone ( digital I suppose) the sound is 100% clearer. Very surprised tbh. 

After much ado I’ve finally got my phone reliably connected to my xk 4.2 2006 amplifier. 
Had a wired fm modulator( see photo) fitted by a professional for £50, it has an Independent power supply to it hard wired in. When it was done it had loads of interference, contacted the supplier and told to fit a ground loop noise isolator ??
Thought he was just fobbing me off but £4.00 later I bought and fitted one from eBay. All  fitted and works perfectly. All now hidden behind the radio including another power supply run from an outlet in the glove box to an adaptor to allow phone charging at the same time. 
All I have is one lead coming out of the dash to my phone. This car is also fitted with an electric aerial so I’ve pulled the fuse to that and it stays down now 
All round a success story. A damned rare thing these days !