Thank you Thank you - all, each, every one of these thoughful, intelligent, insightful and SO supportive replies - how on Earth can I reply to all of them (which I want to do so much) without then expanding this thread to an extreme length, and - I fear - quite possibly repeating someof the stuff over and over.
Heck, I don't even really know quite how to highlight a user name in a reply
. I do however, feel that I must respond in an overview kind of way.... I am very very VERY thankful for this; it is overwhelming - and so many of the posts are also from many of you with absent, deadbeat, nasty and downright USELESS "Fathers". Big big hugs to all of you.
I probably do have a masochistic streak - but my own behaviour seems to have become somewhat conditioned by how he has treated me for, well, most of my life - with a few intervals when he considered me acceptable. But I would almost always put my foot in it in some way - mianly I think because there was no connection on a deeper level; I am not in fact sure if he is capable of it, so I would seem to him (them) to be extremely complicated, and yes, sensitive.
The email means of communication WAS used starting in 2010, at his insistence. In the end I found it incredibly hard to have terse and demanding emails (and usually unkind) just drop into my life; I would always read them immediately and, trust me, they have had some far-reaching consequences. But I re;lise that that is due to my own inability to read, reply or not, and then move on with my day.
I have always given him more importance than he "deserved"- for example, when he complains about the length of calls, I remember a message I received a few years ago, "Well, I don't mind speaking to you, um, every few months or so, for about 15 minutes, but I'm not promising anything....". This did not happen, and conversations have possibly happened every other year, or less. How on EARTH can that then be natural, or easy..... And woe betide I miss a call (accidentally); he wouldactually have counted how many rings (not times) to my house phone, when I said I didn't get to it in time. If I miss a call, it is because I don't want to speak him he says - so, to twist it, he changes it to HE will NOT speak to me on the phone...... So so many double standards 
I am - I think - attaching one of the previous letters. Which may cast me in a bad light too. I referred to it before; it is a repeat of one that he sent (as it says) at the start of 2019, when I had commented by text message (I did not have his address at that time, he had recently moved) about his complaint about his children/grandchildren (from his marriage to my mother). You might be able to see that he re-sent the original with some additional comments, and also that he was very cross at that time.
I don't know about you lovely people, but for me, writing a letter does give a person a chance to possibly reflect on what they are saying - to edit and then maybe not even send, for fear of causing distress....
I always remember hearing, "A letter is like a hand-grenade with the pin removed, thrown into a room and the door closed". That is something I do bear in mind when I think of writing to him (in letters prior to this, he was also telling me NOT to even write..... hence no address available for many years; although he of course could write or email as he chose....), or indeed to anyone when the letter covers several different subjects and is of course, not possible to respond to on the spot. This is why he prefers that medium I think; can anyone imagine saying some of the stuff out loud that he has written..... AND to someone you hardly know - but are supposed to love in some way (yes, he often qualifies "love", even just at the end of a letter -if it is omitted, it will be intentional). 
I have removed some of the names I think..... not my mother's (and no-one I know will EVER read this - even when it is made into a novel or TV series
) and the Maureen he refers to is his second wife (I think that lasted less than four years.....). I adored her and her family, but once she was gone, so were they. I am always amAZed when I hear that step-parents keep in touch with their step-children when marriages break down. I never even knew that could be a thing!
(I did catch up with her sister via facebook a few years ago - but it really did not work very well..... Long Lost Family, my a**e
)
If I NEED to do more to remove names, I will try....
No-one needs to read this letter if they prefer not; but it may give further insight into what the communications have been like. It does not even cast me in a good light - unless, like all of you lovely ladies (people?) , you have a such sense of understanding, empathy and, of course, emotional intelligence.
In the days when I DID try to write back, I would sometimes try to be subtle, hopoing that he would read between the lines. Heck he didn't even read THE lines, some hope of him reading between them.
The call that he mentions when I was "wanting something" was shortly after my Uncle had called me late at night, sounding very sad and mysterious, the voicemail saying, "I have some important -- uhm - news about your Dad". Imagine! I thought he had died, or at the very least been taken suddenly ill. (Nope, they had talked about my father buying me ahouse to rent from him - mentioned proviously on here I think... But I was not to ask about it.)
This fear had prompted me to call a few eeeks (!); which lasted I think (shock!!) about 10 minutes - AFTER he had tried to get ChattyPatti [I LOVE that!] to fend me off, and in turn prompted him to resend the letter as attached. (This is the one that I waited 6 months to open. Wish I had waited even longer.) Anyway, his health was fine, and he was obviously not dead. But I do worry that he will haunt me when he is 
So SO many apologies for the terrible self-absorption I am demonstrating (see, he's right....) But I am just so so thankful for the support and advice and just well, words and thoughts from you all.
xxxxx