rovers; such situations are frequently discussed on this forum therefore you need to do some reading here.
Shortly; no inventory= the landlord has no leg to stand on with regards to witholding of the deposit. This is because he has no evidence to compare "before" and "after". Next; read
http://www.consumeractiongroup.co.uk...tml#post643195
Write to the landlord demanding full return; he spent YOUR money without your permission, knowledge and against his initial advice. Give him 14 days. Bang on the 14th day, write Letter Before Action where you reitarate your point, give hi further 14 days as a last chance to reconsider. Finally, ask the court to issue summons.
come back any time to ask further questions but make sure you read the threads here first.