Source: BBC News
The UK Sikh Federation says it might take legal action over the Office for National Statistics' 2011 census form.
It says the ONS is breaking the law by putting a box for Sikhs to tick in the voluntary religion section of the form but not one in the ethnicity section.
It fears this will result in the number of Sikhs being underestimated and mean community services get fewer resources.
The ONS says space is limited on the form and putting the Sikh box under religion will generate the best data.