LONDON, Sept 24 (Reuters) - A new jobs support schemeannounced by British finance minister Rishi Sunak will notprevent many furloughed workers from losing their jobs, the headof the Institute for Fiscal Studies (IFS) think-tank said onThursday.

"This is a v big change from furlough. Less generous. Onlyopen to those who are working a third of normal hours," PaulJohnson tweeted.

"Understandable given need to adapt as economy changes.Can't pay all wages forever. But a lot on furlough now likely tolose their job."

(Reporting by Andy Bruce; editing by Stephen Addison) ((andy.bruce@thomsonreuters.com; +442075423484; ReutersMessaging: andy.bruce.thomsonreuters.com@reuters.net))