Chief whip Julian Smith has just emailed Tory MPs putting them on a three line whip for Tuesday afternoon. No explanation has been given.

Dear colleague

Please be advised that the whip on Tuesday will now be a three-line whip from 12:30pm. All colleagues should be on the estate and available. 

Many thanks for your cooperation.

Julian

Sajid Javid’s Commons debate on anti-Semitism is scheduled for Tuesday afternoon. Unless the PM now thinks she has the numbers for a retrospective vote on Syria…

UPDATE: Senior government source says “no change in our position” but a second government source says they are planning for a retrospective vote on Syria.