Advice about my landlord?

Hi all i live in a privately rented house and i have fallen out with my landlord as basically the house if not in a fit state, we have not had a boiler check for the first two years that we were there but have just received one this year, the fire has been condemned and one plug socket is powered by a wire going through the wall and plugged into a socket in the kitchen, there are no smoke alarms in the house and the back door was forced by an intruder and is now broken (this was reported to the landlord but was ignored) water leaks through a aerial socket in the conservatory, the drains back up in the kitchen, the toilet blocks all the time upstairs and downstairs..... need i go on, my landlord has now issued me with a hand written notice to quit, is this acceptable? he told me to vacate with immediate effect we havent had a tenancy agreement for two years! and we dont think the mortgage on the house is a buy to let as we have his mortgage statements coming here! could someone shed some light on this? we are pulling our hair out! (we have had some really good advice from a solicitor) but just want someones opinion who has been in this situation before!