Just to update, wired in the satnav no problem. Fed the satnav cable down into the fuse area, plugged it into a female cigarette lighter socket , cut the end of that socket wire and terminated the earth in ring connector which I then connected to stud in the fuse area and fed the power wire through an inline fuse and then using a piggy back fuse holder into fuse 42 (cig lighter) in fuse box. All works fine. Thanks for the help.