Ambassador, British Airways; FlyerTalk Posting Legend
Join Date: Apr 2012
Location: Leeds, UK
Programs: BA GGL/CCR, GfL, HH Diamond
Posts: 43,068
2yo and above needs to be guested. Discretion is very unlikely at LHR. As a GCH you would only be able to guest 1 child in.
Could you link to the BHD post please? Occasionally at outstations discretion is applied but there is no under 16 policy that I have ever seen mentioned.