All Gas Safe registered engineers may have an inventory of the work they're certified to carry out on the again of their Gas Safe copyright. https://3twm7wesfygtqmjta7hjmczsovm2t33zmuhnm7h47lutfj6blymq.cdn.ampproject.org/c/wikimapia.org%2F%3A443%2Fpukiwiki-1.4.7_notb%2Findex.php%3Fgasspace35/