I saw your advice on fitting a new mcb board noticed there was no mention of an electrical test when the job was completed. how do you know its safe to use? Being an electrician i found this most disturbing, knowing as i do, that all circuits when new or an addition to an original should be tested to the 17th edition of the IEE regulations. The mind boggels what could have happened in the event of a fault on the circuit, and the risk you are taking in switching the circuit on without a test being undertaken and results recorded on the correct test cirtificate.