Well I got it and it is already excellent.
Bought it, got in the car. Didn't boteher with the holder. Plugged my postcode in and said Ok. Picked the rout eup so quick I was quite surprised. Anyway I had a couple of places to go in Lincoln, so I drove to them and the good new sat nav made corrections as i went along and then I drove home and it was faultless.
What did I get - Garmin Nuvi 760T (UK & Europe)

I shall miss having a go at the missus and kids LOL :-)

Thanks everybody for your wonderful help.

One question for the experienced sat navvers (no rude answers please) - wher do you place the holder in your car? Dashboard or windscreen. Is windscreen legal?

Cheers
Les