I was discriminated - Sales Assistant Superdrug Employee Review

I worked at their Upton Park store (for NVQ training) but got discriminated by the managing directors. They did not like my presentation. I was wearing a green T-Shirt and black trousers because that was the dress code. So I could not see how. I eventually got a position at their store in The Romford Mall. But was discriminated again because of my work speed. This was because I was on medication which can slow down work speed. They should have took this into account. The reason I did not tell them at the interview because I was not asked.