No hot water or heating after new bathroom

If you have no hot water or heating it is likely that the boiler isn't firing up.

Start by adding water to the system.

Since you have a Worcester combi boiler and no hot water or heating anywhere, the issue is almost certainly with the boiler itself rather than just your new bathroom plumbing. Common causes: Low water pressure – check the boiler gauge; it should be around 1–1.5 bar cold. Too low and the boiler won’t fire. Isolation valves – make sure all valves to the boiler and new bathroom are fully open. Fault codes – check the display for any error codes (e.g., E01, E02). Diverter valve or internal fault – if the diverter valve is stuck, the boiler may not supply hot water or heating. Recent work issues – air in the system, debris, or blocked condensate pipe can stop the boiler.