If you used to be CORGI registered and have previous gas work experience but your gas qualifications (e.g. ACS, City & Guilds or ACoP) are over 5 years old they will not be considered as acceptable for CORGI membership.
You will need to undertake ACS assessments in the areas of gas work you intend to carry out at an approved ACS assessment centre.
You will need to provide the ACS assessment centre and CORGI with evidence of your expired gas qualifications and previous gas work experience.
Once you have completed your ACS assessments you can apply to CORGI for membership.