Bit of a longshot, but does anyone know which was the last of 410/7410-420/7420 to be repained out of NMS livery into full Arriva livery?

Vaguely remember sometime early in 2001 riding a then newly repainted Palatine II in Arriva livery then days later, riding one still in NMS livery but fitted with a new Wayfarer 3 Ticket Machine.