I need to find a 3 wheel scooter?

im looking for a 3 wheel scooter for my friends mentally handicapped son he is seven years of age but i can only find scooters for up to five year olds he needs 3 wheels cos he wud hurt himself on a 2 wheel one im having a lot of difficulty finding a 3 wheel scooter (im in the uk) can anyone help please

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