NCN 1 replaced with triangles??

Does anyone know what's going on with the National Cycle Route 1 between Berwick-upon-Tweed and Melrose? The route numbers on the blue signs have all been replaced with wee triangles, see picture. Quite a big job, must be hundreds of them, so was intriguing. (Was a nice ride and easy to follow though 👍🏻) Photo taken today in Norham.

Does anyone know what's going on with the National Cycle Route 1 between Berwick-upon-Tweed and Melrose? The route numbers on the blue signs have all been replaced with wee triangles, see picture. Quite a big job, must be hundreds of them, so was intriguing. (Was a nice ride and easy to follow though 👍🏻) Photo taken today in Norham.