strongly suggest you write (yes, write..) - email also if you can, keep copy (but WRITE) a calm & polite letter asking for ALL issues that bother you to be fixed..and give him, say, 7 days to respond with a plan to fix them. Not absolutely sure if all those faults listed are his legal responsibilities.. but certainly think some are his responsibility. Certainly patio step would worry me (as a landlord) & I'd want to fix it & I'd want to ensure all locks worked effectively (otherwise my insurance might not pay out..)
When you say "I have patio door installed..." do you mean you installed it or that it came with the house..
Until you get his reply & have taken further advice/reposted here I would advise against you doing anything to fix things yourself- but if you need advice 'phone Shelter,
0808 800 4444 for **free** advice, but expect a wait from this excellent but overworked charity.
When you signed up the tenancy (? can landlord prove he served an AT5 notice on you prior to your signing the tenancy..) the landlord will have /should have served a “PRHP” letter to you telling you all about PRHP, the "Repairing standard" & how they can resolve problems between Landlord & Tenant .. see,..
The key thing will probably be the "Repairing standard" which basically says what the landlord should fix.
- but you have to have tried to resolve the problems in a sensible way first.. so write that letter..
If you paid him in cash did you get a receipt??
Please post again with updates of what happens.
I am legally unqualified: If you need to rely on advice check it with a suitable authority - eg a solicitor specialising in landlord/tenant law...