UK Property Law
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Yes, it would be worth informing your landlord to the extent that it may be necessary for you to have his authority to converse with the management company on his behalf but apart from that I would not expect your landlord to get too involved really.
I'm not sure about the councils database that you refer to. A person may rent to whom they choose unless there is a Court order to the contract or some statutorty power afforded to the local authority to prevent this. If it is just an apartment then he would not require a licence from the council to rent, so they coudl not enforce via this route. Otherwise it would be court action and I shouldn't think the council would be inclined to make an application in any event but certainly not in these times or austerity. The issue of danger/seriousness would again come in to play aswell. Trust this clarifies, if so please click accept.