They are getting much hotter on this at POP. The last time I went back to the UK a guy stepped out of nowhere as soon as I went through the entrance "how long have you been on the island sir?" he asked. I do have my residency otherwise 'mega dosh'!
That annoying little man @ POP has actually been appearing between the X-ray machine and Immigration for almost two years now. His job is to sort of to redirect "overstay traffic" to the cashier. I guess this might be some sort of attempt to clean up the attempted propina to the Immigration officer vs paying the full freight at the cashier?