Took a bit of perseverance, but some pertinent points seem to be:
In practice ads for the following products are prohibited:
Nicotine-containing disposable e-cigarettes
Nicotine-containing e-liquids
Any e-cigarette which can be used to consume nicotine-containing e-liquid even if it is marketed as being for the consumption of non-nicotine e-liquid.
And:
Media which are subject to the prohibitions The rule in the CAP Code contains two bullet points. The first prohibits advertisements in: newspapers
magazines
periodicals
The second bullet point prohibits ads in “online media and some other forms of electronic media”.
Sounds like it has implications for the forum.