Sarah Lancashire wore a wig for years, but her ‘current’ look as Racquel is her real hair.
Oh crikey! Why did they make her wear it?
If I remember correctly, they did, to make her look more ‘motherly’. (She was on the Jack Docherty Show, which is how I know all this, because he was asking her how come her real hair was so different.) She does eventually switch to her real hair; it’s written into the script.