Wolverhampton was one of the few major towns not to have municipalised its gas company and, like many parts of London and LIverpool, continued to be supplied by a private company until nationalisation in 1949. I do like the way the company puts itself in the list along with several of the largest undertakings around! The illustration, sadly not acknowledged, works quite cleverly in one colour, giving the impression of radiating heat and light, the basis of the claims of the product. Unusually it is firmly aimed at the industrial client with no mention of the domestic market.
via Flickr https://flic.kr/p/2bCRJ2x