Last week, I spent a few days touring Cornwall and Devon and again didn't see another GTR. The same as when I did a run from Lands End to John O'Groats in July. GTRS are as rare as mermaids down there ;-)
I live near Exeter in Devon and have a white MY10 but you are right I go weeks without seeing another GTR although one day last week I saw 3 in a day.
I work near JFE Nissan so you would think I would see some as they come and go for servicing but no.
Having said that I have driven to Central London and back before (400 mile round trip) and not seen any.