Repair Concealed Toilet Cistern – Water Continuously Running

I need an experienced plumber to repair my concealed toilet cistern (built-in wall-mounted flush system). Problem: * Water continuously runs into the toilet bowl and does not stop. * When I turn off the main water supply, the water stops. * When I turn the water supply back on, the water keeps running. * I suspect the inlet valve or float mechanism may be faulty. Work Required: * Inspect and identify the faulty component. * Repair or replace the inlet valve, float mechanism or flush valve seal as necessary. * Ensure the cistern fills correctly and automatically stops. * Check for leaks and test the flushing system. The cistern is accessible through the flush button opening. Photos are available.