To be honest the first thing I would do is write to everyone making absolutely sure nothing else gets sent to your old address. Or speak to the PO about getting a redirection, but if I remember rightly to guard against fraud they send the acknowledgement to be actioned to you from the old address and he will probably not pass it on. (It's something you should do before you move).
I would ignore all contact from him in future.
You will have to get a solicitor for the divorce anyway, so organise that now. He has no right to contact, although he can apply, but if there is no parental responsibility then as I said earlier he simply won't get anywhere.
Alternatively, ring 101 and report him for harassment and abusive behaviour, or speak to NCDV as I advised above. The new definition of domestic abuse now states:
"Any incident or pattern of incidents of controlling, coercive or threatening behaviour, violence or abuse between those aged 16 or over who are or have been intimate partners or family members regardless of gender or sexuality. This can encompass but is not limited to the following types of abuse:
? psychological
? physical
? sexual
? financial
? emotional.
Controlling behaviour is:
a range of acts designed to make a person subordinate and/or dependent by isolating them from sources of support, exploiting their resources and capacities for personal gain, depriving them of the means needed for independence, resistance and escape and regulating their everyday behaviour.
Coercive behaviour is:
an act or a pattern of acts of assault, threats, humiliation and intimidation or other abuse that is used to harm, punish, or frighten their victim."
But I'd advise you to get a solicitor for the divorce anyway.