"if in doubt ask" seems fair enough - everyone must be aware that theirs isn't the only culture you deal with, especially somewhere as ethnically diverse as Newham. Expecting you to identify, know about and adhere to every aspect of every patient's religion is as non-viable as expecting you to speak every patient's language. What you're trained for is the medical stuff, and in a medical emergency (which is supposed to be the only thing you're called out for) everything else is just trimmings.