A quote from The Daily Telegraph, 14 October 2006

[British Airways] Heathrow check-in worker Nadia Eweida claims she was effectively “forced” to take unpaid leave after refusing to remove the Christian symbol, which is about the size of a five pence piece. […] Miss Eweida, from Twickenham, West London, said she wears the cross because of her deeply-held religious beliefs. She said: “I belong to Jesus – one body, one spirit, one baptism.” Miss Eweida is from an Egyptian background and attends Pentecostal as well as Arabic churches. [...]

A BA spokeswoman emphasised today that  “[…] Our uniform policy states that these items can be worn, underneath the uniform. There is no ban. This rule applies for all jewellery and religious symbols on chains and is not specific to the Christian cross. Other items such as turbans, hijabs and bangles can be worn as it is not practical for staff to conceal them beneath their uniforms.”