Wearing insignias of one's religion like hijab, turban, bangle or crucifix should not be allowed if it is for reasons of security, health & safety or effectiveness at work (e.g. broadcaster wearing Niqab) especially in the fields employment, security, health & safety.
Employers or organisations (like TV companies, healthcare, teaching, banks, cinemas) should be able to ban Niqab & Burka, or other religious symbols for various reasons, without having to face racial discrimination court action.
However, Niqab & Burka hood, mask, helmet can hide the identity of a person, hence they should not be worn for photos required in passports, driving licence, travel & ID cards, etc, as well as for health & safety reasons.
Body searches may be even more necessary & intense for those wearing long robes & veils. Niqab & Burka can give rise to the lack of body language, as well as not demonstrating trust and openness/transparency. Niqab & Burka can be a barrier to effective communication & establishing trust & rapport - like in testifying in Law Courts, working in professions that require interaction with people (like healthcare, teaching, customer service, hospitality, counsellor, etc)
It should be possible for Niqab & Burka to be banned for various specified public gatherings (like buses). Women wearing veils can be a barrier to integration into British secular way of life, where religion is kept as a private affair without affecting the lives or well-being of society.
The differences between Muslim full head covering of Niqab & Burka, to partial head covering of Hijab, Chador, Al-Amira, Shayla, Khimar are illustrated in
http://www.bbc.co.uk/newsround/24118241