exotic pets in council house

so this is my tenancy

10.4.1 You must not keep any animal, bird or domestic pet except:

• cats or dogs

• a small caged bird (not a pigeon)

• a small caged animal

• a fish in an aquarium.

i asked if i could keep a bird of prey awhile ago and they said no give me no reason why just clear no and i said ok but have just came across this

A Tenant must seek the prior written consent of the Landlord should they wish to keep pets or other animals at the Property. A Landlord must not unreasonably withhold or delay a written request from a Tenant without considering the request on its own merits. The Landlord should accept such a request where they are satisfied the Tenant is a responsible pet owner and the pet is of a kind that is suitable in relation to the nature of the premises at which it will be kept. Consent is deemed to be granted unless the written request is turned down by a Landlord with good reason in writing within 28 days of receiving the request

i have today rang them up and read this message out to them on there voice mail do they have to give me a good reason why not or does this only apply to private landlords