Please confirm that you don’t share any facilities with the landlord.
Why has he given you a licence to occupy rooms instead of a tenancy agreement?
Is the accommodation self-contained?
Have you referred the lack of hot water to the Environmental Health Department at the local authority?
Have you referred the other various hazards?
You can complain about the lack of hot water general condition and safety of the property to the Environmental Health Department at the local authority. They have the power to make the landlord fix everything.
You can complain about the burnt out car to the local Planning Department who have the power to serve notice on the landlord to move the junk even if the junk is on his own property, if it looks a mess.
You would be entitled to compensation in respect of landlords breach of covenant to repair and in that respect, you might want to see a solicitor because you may be eligible for legal aid.
Do bear in mind, that depending on the terms of your tenancy agreement, if you start to make things difficult for the landlord, he could well give you notice to quit but he would have to give you at least 2 months unless you share any accommodation kitchen bathroom or living accommodation, with him.
Is there anything else that I can answer for you?