Hi Belle1,
Like Dermot, your probably not going to like what I say either, but i'll offer my opinion anyway.
There seem to be two different items.
The friend loan - Its always easy to look back in hindsight and say it was a bad decision, and I myself have had loaned money to friends for much, much, much smaller amounts and had difficulty in getting it back. That was my own money and my own poor judgment and I didn't borrow for it. SO I paid the consequences which i fully accept. is there any legal or otherwise trail to getting that money from that "friend" ? are they still your friend? it sounds like probably not. Can you force that person to sell whatever asset was used with the money?
The Mortgage -
You seem like a good person, and I can understand that you want to do the best for your family. You said you believe in paying your way but still want to take the rental money, stop paying anything towards the mortgage and do a runner to another country, leaving huge debts for the rest of us to pick up the tab.
What if we all had this attitude? the country would be an economic wasteland.
There also seem to be unpaid taxes since 2008 from the rental property.
In fairness, you did sign up willingly to the mortgage (and the other loan). So there should be consequences of some sort for you. I know having to leave the country might be considered a consequence but I mean financial consequences.
As a taxpayer who will have to live here after you leave, Its not fair on the rest of us who will have to undergo further fiscal measures because of this action.
It should be an option for the bank to roll up the total debt, sell the house, get what they can and work out something with you. any debt writeoff should go on your ICB record and stay there for 20 years, maybe they can let you get settled in the new country and once you find work and your feet you could make some payments.
It might not be feasible to get every penny back, but we need to show the prudent taxpayer who didnt overborrow, who lives within their means and who will have to continue to pay taxes here some value for money and reward for being prudent.