I have a leaking toilet cistern and the flush mechanism isn’t operating reliably. The issue seems to be a worn flapper and a slow leak into the bowl, plus occasional running after flush. I’d like a skilled handyman to diagnose and fix the problem, replace worn parts if needed, and ensure a proper seal. Ideally, the work should be tidy, with minimal disruption, and I’m hoping for a same-day or next-day visit if possible. Please confirm parts availability and provide a rough estimate before starting.