Make tattoo discrimination illegal in UK employment

For the last year I have been employed and directly discriminated against for having tattoo's by a private employer.
My tattoo's are not aggressive , political or unsightly but a reflection of my individual personality.
I work outside in all weathers but was told to cover my arms as my tattoo's were on view which was deemed to be unsightly by my employer.
I do not have any contact with the general public but as my employer is "old school gentry" it was forced upon me to wear long sleeves. My employer even supplied me with a uniform to cover my tattoo's even though it is different to the other employee's which has alienated me within my employment.
Subsequently I have made the decision to leave this employment.
Please help me make tattoo discrimination in the workplace by employers illegal in the UK.