Discrimination

In Britain, there is no written constitution, unlike France. In France, the constitution guarantees in its first article equality of origin, race or religion (but not gender).
In Britain, there is a Race Relations Act (1976) and a Sex Discrimination Act (1975), but nothing that guarantees religious equality.
The problem of having a written constitution is that, as is the case in France, an article in the constitution can prevent change taking place. For example, in France it is possible to have affirmative action in favour of women, since there is no mention of gender in the constitution, but it isn't possible for minorities, since it is clearly stated that all are equal regardless of origin or race.
I'd be interested to know what readers think, and particularly whether they think there should be a 'Religious Relations/Discriminations Act'.