He grabbed your top that's actually an assault.
He has now assaulted you twice in less than 24 hours
I'm a bit concerned about your local police station, the uk's DV procedure is that you do not have the option of pressing charges or not so he should have been arrested,
They should have given you various support service info and done a risk assessment for you and you should have been given some face to face police support and someone from the DV unit should be contacting you ASAP.
I very very much doubt that his police officer friend did tell him anything as he may be his friend but even friends don't like doing favours that get them sacked.
If he had then it would be a serious (dismissal type serious) issue,the type of thing that tends to end up on the front page of the papers, seriously it would be that serious.
Does your husband have a habit of making out he knows everybody that loads of people mention seeing you to him,that it would be hard for you to do anything without him finding out,when you argue does he try to back up his stance by saying that everybody else agrees with him,that sort of thing?
I ask because its much more likely that he is saying that to you to attempt to isolate you from support AND to have you perceive him as all powerful its a very very common thing for blokes like him to say and given that you know he has police friends it would be a very obvious thing for him to use like that.
I have worked in domestic violences services for over 20 years now and in that entire time I have only ever known 1 police officer do anything like that and it was by accident ( the victim was married to a policeman a colleague of his saw her in the station and assumed she had come to see her H and mentioned seeing her).
The best way to call his bluff is to put a complaint in or raise it as a concern with the duty inspector if his mate did tell the shit will hit the fan or his mate will go out of his way to avoid even a hint of people thinking he did and probably drop your H like a hot potato.
Keep all text messages from him and try not to respond to any if he phones don't bother answering,your call logs can be great evidence of harassment,if he turns up again on the doorstep try to avoid opening the door so he can't push past you again ( incidentally that's another assault)
Does he have a back door key? If not use that door to go in and out and leave your front door key in the lock even when out that way he can't get in when you are not there.
If you want to pm me your vague area I can see if I can find you a DV outreach worker near by to help you.