This Ahmadiyya structure, the Fazl Mosque, is the oldest mosque in London
(Wikimedia Commons public domain)
Thanks to Nicholas Garaycochea for bringing this video (based on an event some months ago) to my attention:
https://www.facebook.com/nicolas.garaycochea/posts/10155140627782891?notif_t=like_tagged¬if_id=1490333390159644