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BBC Wales business correspondent
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BBC Radio 5 Live
Wake Up To Money
The Frankfurt Motor Show is taking place and the BBC's Theo Leggett has been speaking to car industry bosses about a number of issues, including Brexit.
He explained on Radio 5 Live's Wake Up To Money that Jaguar Land Rover's Ralf Speth has been telling him about the important of fast movement of goods after Brexit.
"In order to produce vehicles we need in the UK between 30 and 25 millions parts a day, delivered on time, in order to assemble a vehicle. and it if's guaranteed we have a frctionless trade ...then we can continue production.
"But if we don't have the parts we need we will not produce the vehicle. And that will be an issue not only for us but also for the smaller suppliers".