Desperate for up to date advice..

HI - newbie to the forum, but not to divorce, sadly.

Divorced in 2003, lost house, was making massive payments to both ex-wife and son that nearly caused me to lose my business. I managed to get those reduced a little once I ditched the solicitor (whose advice to me at the time was "just agree to everything she asks"). I ended up living in a caravan for many years because of that solicitor - no GP, no fixed address....eventually losing contact with the son because he didn''t want to stay in a caravan.

Since then, I''ve managed to get a bit more back on track, via over a decade of working on a hideous pit of a house. The house still needs more work but it''s liveable. It was bought very cheaply, and has not increased in value because of its location. But it''s somewhere to live. Meanwhile the wife has a £400k home and her husband has a £500k home.

My only son supposedly has just one more year left doing a foundation degree. I''ve never skipped a payment on his maintenance over all this time. When I''ve not had food, he''s managed to still have the latest i-gadgets (bought with my money). He''s just texted me asking for more money per month. He''s 20. I don''t have any more money to give him but I''m concerned that he might try to get more forceful (legally) - and I do have the house (worth...65k tops).

So - I am planning to give him what he''s asking for, but give it him in one lump sum (which I will borrow), for his final year at college, and ask that his mother (and he) agree to ''closing off the order'', or whatever it is called in legal terms. Effectively, I want to give him the extra, but in return I would like an end to the order. I do not intend to cut and run after that. If he needs me in the future, I will be there , but not as a mug.

From what little I know, I need to ask the court for a form, that the ex-wife would hopefully sign (I have no contact with her,her choice)
and I would sign, and then the court orders the matter closed. I do not want to employ the services of a solicitor.

Is there anything in my idea as above that could go horribly wrong? It is actually far from a given that I''m going to be able to get the ex-wife to agree to this, but they DO both worship money, so they may be tempted. Once the court have closed off an order, can the son come back if he decides to do course after course after course after course? I don''t pay the ex-wife any maintence. I did for many years but when she got re-married, that stopped.

thanks for any input whatsoever, all is appreciated.

I forgot to say, the order says words to the effect of ''when full time education ceases''. I''m not focused on hauling this whole thing back to court based on the wording of the clause, I''m interested in getting it closed off with no come back, on their agreement to a lump sum.

thanks