Hello The Ouessant are ear tagged and microchipped, after speaking with Defra, the ouessant society, the Microchip registration companies and several vets some time ago, it is permitted to microchip any pet animal not used in the food chain, for stock management use.
They are uniform in colour, the heard is related to the original Cammall herd imported by James Graham, they have no white parentage that we are aware of, I believe neck tassels are a breed characteristic.