[42redcat]

In case you haven’t discovered them already, Pendle Slot Racing in U.K. carry a good range of all brands of slot cars, including Carrera. I’ve always found them really helpful. I’ve had good service and prices from Top Slots n Trains, too. Both have excellent internet/mail order setups.
(I’ve no connection with either - just a satisfied customer, but not a Carrera user).
Mike