Their website explains:
The Anarchist Federation is a growing organisation of like-minded people from across the British Isles who aim to … create a free and equal world, without leaders and bosses.
It is organised
in local groups
coordinate worldwide through the International of Anarchist Federations.
If you agree with the aims and principles of the Anarchist Federation,
you may apply for membership
please note joining the AF requires a level of commitment. Depending on where you live you will either join a local group of AF members or, if there are no other members nearby, join as an individual member. Unfortunately, we cannot accept membership if you live outside the UK and Ireland.
They have a constitution which
contains more information about how the AF is structured as an organisation and expectations for individual members and groups.
All of this doesn’t sound very anarchist to me.