The website seems to indicate that this is a private members' venue, though there don't seem to be any membership requirements.
To quote the pub website:-
"A group of London based promoters/DJs/producers with a combined wealth of experience in the industry have cooked up the antidote to an increasingly commercialised Shoreditch by restoring a tucked away old East end boozer originally named ‘Lion & Lamb’ and stretching its possibilities with some lateral, modern thinking. Comprising three floors, the ground floor will host a bar & kitchen with seating areas plus a record store. The first floor will be office and living spaces, as well as a terrace.
The basement will become a cutting edge, professional recording studio and with this, Lion & Lamb will eventually become a platform for its own community of artists with a record label growing organically once the multipurpose space is fully functioning. Dedicated to providing a true haven of quality for its customers, a key factor is the spaces’ state of the art acoustic design. With the finest underground promoters already queuing up to use the space, it won’t be long before the secret is out… Lion & Lamb is set to become a favourite destination for creative people and music lovers in the area."
Lion & Lamb, London