It is exactly the sort of under the radar mischief that the Tory dirty tricks department does, do not underestimate them. They were very active during the referendum and are implicated in the Alex Salmond affair, TM has done well to sidestep their efforts so far, she must have a very good advisor looking after her interests
I am very cynical about party politics, why not discredit your rival, perpetuate the agony the media love it, Corbyn does make himself an easy target though.
There are plenty of Labour MPs and councillors who dislike Corbyn, others just want the issue to go away, no coordination though.
As an aside comment. I was discussing Brexit with one of my cousins last week, extreme Brexit views, for emotional reasons ( her words), she wanted JR-M as PM. There are a lot of extreme right wing views circulating.