I've read the books, DB, Silent Sons, Jim Conway, it all fits.
What doesn't fit is this, total black out, total no contact.
H last saw sons just after Christmas.

H filed, unreasonable behaviour, total fabricated reason but I didn't contest, not easy to do in the uk.
reading between the lines of the communication between lawyers H has OW, he is in a hurry for funds, he is angry with me and suspicious to the point of paranoid. H is questioning my income and expenditure.
H has gone awal only contact through solicitor, he does see his family.
MIL very defensive and protective of H to the point of cursing her own grandsons.
sons 18 & 15 have totally given up on H, I am at the point of no return.
The cruelness and harshness of all this has been tiring, I have detached to a safe place along with my sons, trouble is I feel now that I want to close the door on H.
I will have to face H in court, I don't know what to expect, I'm not sure if I will recognise him.
this is a stage I didn't want to reach but i will be D before the end of the month.