The 1st Mosque that was built in England [in Liverpool] by a British revert by the name [William Henry Quilliam - Abdullah Quilliam] back in 1887!
Tour of what is left of the Mosque by British revert brother Yusuf Chambers.
Side Note: this video was made back in 2012 so i have no idea what happened to the Mosque.
For Cell-Phones Click This Link To Watch The Video If You Can't See It Above: