Dominic Grieve will vote for the motion proposed by Starmer and threatens to resign the Tory whip if faced with leaving with no deal. No real surprise.
Dominic Grieve - Wikipedia
On 29 March 2019 (the original planned date of Brexit), a Motion of no confidence against Grieve was carried by his local party 182 votes to 131. At this, Grieve said he'll carry on 'exactly as before'. The motion triggers the first stage in the process of deselection.