What is a Commercial Kitchen CP42 Gas Safety Certificate?

This is the official term for a safety certificate that is issued annually by a registered Gas Safe engineer to cover all gas installation and appliances in a Commercial Kitchen. These certificates are specifically for commercial kitchen facilities.

I have cold spots on the radiator, I have bled the radiator but it's still not cleared – what should I do?

Power flushing the central heating system involves flushing the system with a cleaning agent to remove any build up in the system (see video)