I ended up liking the idea of having an aux in as an alternative to using an FM transmitter, so I bought the lead on ebay
ebay.co.uk/itm/Female-3-5mm … 2749.l2649
Luckily I found one with the female plug on it, so didn’t have to cut and solder anything to make up the connector.
Then got one of our helpful mechanics to install it for me.
Very neat!
GP