www.thetimes.co.uk/edition/news/english-police-could-patrol-northern-ireland-border-after-no-deal
"Ministers have drawn up detailed plans to deploy police officers from English forces to Northern Ireland in the event of a no-deal.
In high-risk or emergency situations, police can be sent to other parts of the UK in a procedure known as mutual aid, previously used during the London riots and the G8 summit in Fermanagh"
Because I am sure that history has something to say about that. First we send in the police. Then who do we send to protect the police?
They are playing with fire.