Thanks to both..
I have visited Switzerland many times as a leader on School trips.
We stayed near Interlaken on all visits.
So yes the I am well aware of the stunning views near Interlaken Kandersteg and also Lucerne (Pilatus) Les Diablerets Montreux etc.
That was all over 20 years ago and before I was married so a revisit for me and a first visit for my wife is the order of the day.
Thanks and yes I use Camper Contact and CC Infos and thus there seem to be sufficient cheap or free spots.
Rutti camping at the foot of Stechelberg seems OK pricewise as does the farm site near Weggis.
Content to pay a bit more sometimes so I think we will give it a go.
Expensive sites in Switzerland will be compensated by the use of cheaper overnights in France Italy and Germany.
Austria is also OK ish and it is easy to pass through without a vignette (Austria)