(although Lesser Scaup was reinstated in 2020), Black-winged Stilt and Red-flanked Bluetail in 2017, and Lesser Yellowlegs and Arctic Warbler in 2019. In 2021, for the first time, White-spotted Bluethroat became the first taxon to be added to the BBRC list that hadn't previously been removed (except British firsts). Once removed, a species is classed as a "scarce migrant": British Birds publishes a separate annual report summarising the occurrence of these species, and the data is also presented on the Scarce Migrants website. Aside from breeding species, Cetti's warbler, little egret, long-tailed skua, Mediterranean gull, Cattle Egret, Great White Egret and Yellow-browed Warbler have become so common that they no longer qualify even as scarce migrants. Structure and personnel The committee has ten voting members, a chairman (who may be one of the ten, or may be another, non-voting individual) and a non-voting secretary. BBRC was assisted in its assessment of seabird records by a Seabirds Advisory Panel from 1987 to 1996. In 1999, the BBRC set up the "RIACT" (Racial Identification Amongst Changing Taxonomy) group to advise on how records of rare subspecies should be treated. RIACT published its first report in 2006, setting out the subspecies it believed were sufficiently diagnosable, and that occurred infrequently enough to justify being assessed by the rarities committee. Prior to this, a partial selection of rare subspecies had been routinely included in BBRC reports; the RIACT report aimed to bring consistency to the selection for future years. When a record is of a species not previously recorded in Britain in a wild state, BBRC deals with assessment of the bird's identification, then passes the record to the British Ornithologists' Union Records Committee, which decides whether the species should be included on the BOU's British Bird list. The committee has two permanent posts, a Chairman and a Secretary: they are appointed by the board of British Birds. There had been no fixed term for these appointments before 2008, however, a three-year fixed term, with a limit of ten years, was introduced with the change of chairman in that year. The current chairman, the committee's seventh, is Adam Rowlands; the six previous chairmen were Philip Hollom (1959–72), Ian Wallace (1972–76), Peter J. Grant (1976–86), Peter Lansdown (1986–93), Rob Hume (1993–97) and Colin Bradshaw (1997–2008). The committee's secretary is Nigel Hudson, appointed in 2007. Its previous secretaries were G. A. Pyman (1959–61), Christopher M. Swaine