Just an update, two auto electricians later 1 claiming a fault with the temp sensor wire but unable to trace any breakages, the next guy claims its not an electrical fault at all but an air lock in the coolant so il give that a try, duz anyone know where i can find the temp sender? its on the wiring diagram in my haynes manual but i have no idea where it is! is it on the fuse box or behind the speedo?