Paul I am so pleased that you have told the children. How totally stupid and insensitive of him to send the email to that account though. But I do believe that now they know the reasons for the atmosphere in the house they will be able to pick themselves up and the three of you will be able to jolly each other along. I can't say that it will be easy from here, but it will be a lot less stressy for you, which in turn will make for a happier home in the long run IFSWIM. As I said before, they are extremely resilient and will understand that this is for the best not just for you, but for their lives too. I also think that this is a HUGE weight that has been on your shoulders for too long and the strength you will gain knowing now that your kids can understand some more will give you more power to steam on... So yay for you! 
Ten They're a nightmare. But you know what - sometimes I've found it is better to just let them make their fuck ups as they inevitably will and they'll soon learn. Once he gets into Year 10 he will realise that anything he does or doesn't do will have consequences, not just at school, but for his future. My DS goes in waves of being a complete PITA and I now leave him. He looks at his older sisters and sees how well they are doing and have done and now, now towards the end of this Yr 9, he is starting to pull his socks up. He knows that I will NOT be funding him once he's left or screwed up his education!!!
Joely He must stick to a proper time for the smalls. Because they are that. Simple. If he is not capable of telling them time and leaving appropriately to get them to yours when agreed then he is going to have to sort himself out. Small children who are tired and grouchy and then being passed over from one parent to the other do not a happy mother make..... I hope they settled at a decent time in the end (or soon if they haven't yet...) I know what you mean about having some support too - when the big ones were small mine was on the continent and I was in London and I had no family close by for that. Its hard work with 3 small people. Perhaps she could come up for May half term or something, nicer weather, kids will enjoy it???
Going yep, DS3 sounds like he could give Bella a run for her money. HE sounds wonderful. When you say you have an early start...knowing the times you post on here sometimes I can only imagine that tomorrow will be at an hour that I haven't seen since I was young and going out all night!!!!!
Hello to everybody else, I too am off to bed, long day, tired mummy...