postcode lottery 
noun British
A situation in which someone’s access to health services or medical treatment is determined by the area of the country in which they live.Stronger local accountability can be a powerful antidote to the postcode lottery....
- The parking needs of people with disabilities must not be decided by what is effectively a postcode lottery.
- They called on the Government to make the care of allergy sufferers a full part of the NHS, rather than a postcode lottery.