Have a look at equality and diversity on the PLA link below:
SCH 33
http://www.pre-school.org.uk/practitioners/inclusion
Equality act 2010 and a
handbook to help
If you google 'equality and diversity policies for early years' there are lots of policies from early years for you to read and get some pointers from. if you want a separate 'inclusion' policy have a look at those online - but remember to include early years in your search to ensure you find relevant policies.