Hi I am a 45 year old electrician with 17th and 2392 and was registered with NIC domestic for 5 years I an now employed by a hotel chain for past 2 years and till now they have never done any testing only employ a firm to do periodics they are looking now to do some installation certs for the works we carry out can I do them as a compatant electrician they are not looking to register with a guv body or do I have to have 2391 can someone advise me please