Thanks to all of you for your support, it really helps.
I'm looking at all the suggestions on the list, and I'm following the advice; I'm posting leaflets and putting posters everywhere, advertised on a lot of website, but until now only one kind soul that called but unfortunately it was a very similar cat but not Squeaky. I was kind of hoping to find her quickly; just a few months ago I received the same type of leaflet, from a neighbour I had never met, and whose cat had been missing for days, and I immediately found their cat in my basement, curled in a hidden corner. I was hoping to have the same luck, but nothing yet...
I haven't contacted Cat Protection in Woking (Clare, yes it would help if you could pass them the details or let me know how I can do that); I tried the Godalming/Guildford number, and got voice mail and the lady hasn't got back to me. I'll try again tomorrow.
And now off for a walk in the neighbourhood looking for Squeaky....