Thanks Brithewineguy. Re RF option for Spyder 4200 stereo improvements . I had by then ordered from Eboltron in the US the Bluetooth adapter kit. The RF unit I had previously fitted tended to loose connections. Eboltron gave good feedback to the equipment he produced. It’s @ $200 and on way to UK. I’ll post an update on the kit in due course. Cheers All Newboy.