No 9582, Saturday, 11 Jul 09, Sankalak

Took a little time over 1A finally had to Google it out as I had never heard of it. Another entertainer from Sankalak's stable.
ACROSS
1 - Sydenham’s chorea awfully daunts vets (sic) (2,6,5) - ST VITUSS DANCE*
10 - Hidden swindle reportedly confirmed (9) - {CON}CEALED (~sealed)
11 - Go off them and begin behaving uncontrollably (5) - RAILS [CD]
12 - Beginning to talk colloquially is not a mark of corruption (5) - {T}{AINT}
13 - Earthquake, typhoon and so on (4,2,3) - ACTS OF GOD [CD]
14 - Biker’s protection that Ethel methodically provides (6) - HELMET [T]
16 - Appearance that is all right in a retired star (5) - LO{OK}S <- )
19 - Prague to the Czech (5) - PRAHA [CD]
20 - Powerful melody envelops troop leaders (6) - S{TR}ONG
25 - Irritation that anyone can overcome (9) - ANNOYANCE*
26 - One in publicity work, crazy chap, loses head (5) - (-m)ADMAN
27 - Piece of metal provided in return for Indian sweet (5) - BAR{FI<-} ) Can't resist saying Yummy!!
28 - Basic course right for a drug user (9) - {MAIN}{LINE}{R}
29 - Unchanging in one’s beliefs but now yielded to hot treatment (4,2,3,4) - DYED IN THE WOOL*
DOWN
2 - Perceivable sharp smell gets bile flowing (8) - {TANG}{IBLE*}
3 - In Latin, that is a part of a snide statement (2,3) - ID EST [T]
4 - What an Internet buff may do with data on state burden (6) - {UP}{LOAD}
5 - Anti-state activity — it is done differently (8) - SEDITION*
6 - Low pressure area that may make fliers lose height (3,6) - AIR POCKET [CD] Makes you feel terrible when you hit one while in a plane.
7 - A call in church to show submission (6) - C{RING}E
8 - Ruin a drink (6) - SCOTCH [DD]
9 - Stage whisper in the main part of a record (1-4) - A-SIDE [DD]
15 - A flier surely unpopular with worms! (5,4) - EARLY BIRD [CD]
17 - Delivery at MCG, say, by one from Beijing? (8) - CHINAMAN [DD]
18 - Special trooper who could exercise control over love (8) - {COMMAND}{O}
21 - Upper class people make an effort to go after information (6) - {GEN}{TRY}
22 - Masters return degree in dance (5) - {SAM<-}{BA}
23 - Capacity to work, could be potential as well (6) - ENERGY [DD]
24 - Excessive devotion of a swimmer consumes alien (6) - F{ET}ISH
26 - Let a stall owner be a part of it (5) - ALLOW [T]