Dear Dave,
Thank you so much for your reply, sad but I thought that would be the answer,as I've sat on the drive for hours going through the Sat Nav menus!!! To no avail! Anyway, have downloaded Maze and on first looks, seemso to do the job, so thank you ! And yes it is a bummer not being able to put in the full Postcode, been used to a fully functional up to date Sat Nav on my last car! This is my very first Merc, and other than the Satnav problems, am thrilled with it. Will post a photo as soon as the weather gets better!