"(1) A person discriminates against another in any circumstances relevant for the purposes of any provision of this Act if- (a) on racial grounds he treats that other less favourably than he treats or would treat other person;"
"3 ... (4) A comparison of the case of a person of a particular racial ground with that of a person not of that group under section 1(1) must be such that the relevant circumstances in the one case are the same, or not materially different, in the other."
"4 ...