Another tenant/landlord type thread!
I believe you have the right to carry out any repairs to ensure the safety and security of your home, if your landlord is unwilling/unable to do them. It is their responsibility, but you have the legal right to safety and security. You could justifiably claim these are emergency essential repairs.
So, as suggested, get the repairs sorted out, and deduct the cost from the rent payment. You'd be advised to get at least 3 separate quotes for the work though, to cover yourself. Electrical, plumbing and gas repairs have to be done by fully qualified/certificated personnel.