People with PKU are more likely to have fair skin, light hair, and blue eyes due to the lack of pigment but in general look no different than you, me, or anyone else.
Some Welsh people: Catherine Zeta Jones, Anthony Hopkins, Stanley Baker, Ioan Gruffudd, John Rhys-Davies, Rhys Ifans, Tom Jones, Bonnie Tyler, Sian Phillips, Richard Burton. There is a Wikipedia...