If your house if managed by Leydon Lettings Agency, then all correspondence should be addressed to Leydon Lettings Agency.
If your landlord is using a let and rent service, you should liaise directly with your landlord regarding all queries to do with moving in and the property itself, but any queries relating to rent or payments should be addressed to Leydon Lettings Agency.
If your landlord is using a let only service, then you should liaise directly with your landlord regarding any maintenance or repair or any other matter. Rent for the first period should be paid to Leydon Lettings Agency, but thereafter it should be paid directly to your landlord, as directed by your landlord.
If you are unsure which service your landlord is using, please check with Leydon Lettings Agency.