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CORGI - 58% of Consumers Still See It As An Essential Factor When Choosing Their Gas Engineer You should ensure that the engineer who replaces or repairs your gas boiler is certified. Recent polling done prior to Gas Safety Week showed that despite CORGI not being the official register of gas engineers, 58% of consumers still view it as an important factor when choosing their engineer. Qualifications Gas engineering is a lucrative field with many possibilities for specialisation and advance