I can't find a GB facebook group for LLL, only small local ones.
There is this group:
www.facebook.com/groups/lllinducinglactation/
'This is an inclusive support group for those looking for information and support on how to induce lactation (bring in a milk supply without a pregnancy) for non-birthing parents, such as surrogacy, adoption, co-nursing, trans/non binary chest feeding, etc; and for those who are relactating for a child they did birth after stopping breastfeeding previously for any reason.'
Group rule #1:
'Please be aware that group members and lactating parents are not all women or mothers. Please avoid addressing the group as "mommas" “women” or “ladies” etc In your posts or replies.'