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Toilet flush leaking,Shower sensor to fix because water not coming from shower.

I have a concealed cistern toilet where water is constantly running into the toilet bowl and won't stop. The cistern has been drained and the water isolation valve is currently turned off. Based on the internal layout and manufacturing codes (stamped 711.10.12.29 verbatim on the back wall), this looks like an Ideal Standard / Armitage Shanks hidden cistern setup. There is heavy limescale buildup inside the tank on both the inlet float valve and the central dual-flush valve tower, which is likely preventing the bottom rubber flush seal from seating properly or causing the mechanism to jam. Access is a bit restricted through the standard front flush-plate wall cutout. The job requires someone who is experienced with servicing concealed cisterns. Remove, descale/clean, or replace the dual-flush valve mechanism (likely a standard quarter-turn twist-and-lift module). Inspect and clean/replace the bottom rubber flush seal washer if it is warped or degraded. Ensure the inlet float valve is operating and shutting off correctly once descaled. Please bring standard replacement flush washers/seals for Ideal Standard/Armitage Shanks dual-flush valves just in case a swap is needed.

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