You must register with CORGI as a member before you carry out any gas work in the UK.
You need to demonstrate that you have knowledge and understanding of UK regulations and standards that CORGI members must abide by when carrying out gas work.
To do this you will need to undertake ACS assessments in the areas of gas work you intend to carry out at an accredited ACS assessment centre - there are currently 230 centres around the UK capable of delivering ACS assessments.
The assessment centre and CORGI require evidence of your gas qualifications and experience from your home country (this evidence will need to be translated if not presented in English language).
Once you have completed your ACS assessments you can apply to CORGI for membership.