Note: Australia is generally considered to be a continental landmass, rather than an island. If however one does count Australia among the islands it, not Greenland, would be the largest in the world (unless one also considered Antarctica an island).
... Hole Museum[?], How Hill
Working Textile Museum[?], Derwent Valley Mills
Northumberland
Grace Darling Museum, Bamburgh
Northumberland Fusiliers Museum[?] in Alnwick ...