Motorway Cockneys was a phrase termed by Bhasker Joshi (and I have probably spelt his name wrong!) on the 11 November 2004. Hailing from Bushey, he was queried over his Watford accent.
“We Motorway Cockneys don't know where we belong.” he told me.
The term "motorway cockneys" describes cockneys that have moved out of London and now reside in corridors along motorways out of London.