BUZZ-Brexit bets boost UK housebuilders as HSBC also pushes sector

** Housebuilders Taylor Wimpey, Barratt Development , Persimmon rise 1.6 to 2.6 pct, among top FTSE 100 gainers

** Traders say parliament's vote late Monday to seize control of Brexit process helps sector sensitive to UK economy

** "Seems soft Brexit more likely," says one trader

** "Brexit considerations probably help," says Paul Mumford, fund manager at Cavendish Asset Management

** Bullish note from HSBC also boosts sector

** HSBC upgrades Persimmon and Bovis Homes to "buy" from "hold", sees average upside of 35 pct in base case

** "We forecast rising free cash flow and +7% sustainable sector dividend yield in our base case and in our bear scenario, despite contrarian forecasts for falls in southern England new house prices," HSBC analysts write

** Good results from Crest Nicholson also help sector rise; stock up 6.9 pct on FTSE 250

(Reporting by Helen Reid; editing by Josephine Mason)