The 2006 record is without an official British Birds reference but Nigel Hudson (BBRC Secretary) has informed me (email) that it has been accepted but not published as such.
1). 2001 Porth Cressa, St Mary's, first-winter male, 14th to 18th October, photo.
(Birding World 14 (10): 409, photo; Birding World 14 (12): 505, photo; British Birds 94: plate 349; M. J. Rogers and the Rarities Committee, British Birds 95: 507, plate 301; Flood, Hudson & Thomas, 2007: plate 110).
2). 2003 Old Town, St Mary's, first-winter male, 15th October; same, Kitty Down, St Mary's, 15th to 17th October, photo.
(Birding World 16 (10): 407, photo; British Birds 96: plate 407; M. J. Rogers and the Rarities Committee, British Birds 97: 597, plate 351; Flood, Hudson & Thomas, 2007: plate 110).
3). 2006 Popplestones, Bryher, first-winter male, 20th October, photo.
(R. L. Flood, Isles of Scilly Bird and Natural History Review 2006: 87; Flood, Hudson & Thomas, 2007: plate 110).
4). 2010 Golf Course and nearby, St Mary's, first-winter male, 12th October, photo.
(Birding World 23 (10): 427, photo; N. A. J. Hudson and the Rarities Committee, British Birds 104: 615; I. & J. Southworth, Isles of Scilly Bird and Natural History Review 2010: 108).