I was told by a BG engineer who serviced our boiler that it will soon be compulsory to have one and was pressured by the guy to have one - I didn't
Having checked if it will be compulsory soon I discovered that it is nothing of the sort, no doubt it will be soon in the name of climate change
so I called to BG to report engineer trying to pressure me into having one. I guess they get commission if a customer has one fitted.
Full of apologies on behalf of the engineer but still asked me to consider it.