I honestly don't remember the faulty installations but I should not be surprised as it was a massive operation. Imagine, every appliance that had ever been made had to have an adaptation kit made for it! I was young at the time but I think ours went well, I remember they couldn't adapt the flame lance on the cooker, for some reason.
Nevertheless if they want to use hydrogen mix gas, it's probably a scam, a work/profit creation scheme, will cost us a fortune in the end, but we will have no choice.