I took a deposit before 1 April 2013 and the tenancy has since renewed. Do I need to protect?

If you entered into a new fixed term agreement with your tenants after 1 April 2013, yes. As a new agreement it is considered a new deposit. It must be protected within 14 days of the agreement being entered in to. 

If the tenancy continued on a statutory periodic basis it does not need to be protected. 

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