muckylugs, a Corgi engineeer will be unable to do this from now on, all boiler installations have to be notified to corgi, all details of the system have to be notified, corgi then issue a certificate of compliance to the householder, this installation is then logged against the installers name, corgi can randomly choose this installation for inspection and if there was any problems with this property in the future gas related, fire, gas leak etc, it would come straight back to the installer, so I can assure you that any decent corgi engineer will not commission and put their name against an installation that they did not carry out and if there are corgi installers out there who would be prepared to take the risk for this practice will certainly want a lot more than a nice drink for their trouble.