Op, I am an ex Bank Manager, and I worked for 20 years in debt collection and Mortgage debt collection.
I don't know if debts 'drop off' after so many years as I have never been in that situation
NO. Of course debts don't "drop off". The only thing I can think of here, is that he is Bankrupt, or he took out an IVA (Individual Voluntary Arrangement) previously. These are 2 types of insolvency, whereupon all Creditors agree to a repayment plan, whereupon the debtor agrees to pay so many pence in the Pound, over a 3 year period and at the end of the 3 years, any remaining debt is written off. Then, after 6 years the debtors name is taken off the Insolvency Register and he/she can start again with a clean slate. If he was Insolvent, I'd be amazed that he had £500pm spare, as the debtor is usually squeezed for every spare penny.
However, if he had such an Insolvency arrangement, the Credit Card Company would NOT be writing to him (not allowed), all correspondence would be from the Insolvency Agency that handled his Bankruptcy or IVA. A firm like KPMG, for instance. Have you seen the correspondence that goes to his Mums?
If the letters are coming direct from the Credit Card Co, then he has no such arrangement and if he ignores their letters, they will obtain a County Court Judgment against him, and once they have that, they will decide which Post Judgment Remedy to use, in order to extract money from him, to settle the outstanding debt. This could be attaching his earnings, levying his car, or obtaining a Second Charge on his mortgaged house.
The only way he could halt this, is to speak with them. They would most likely agree to freeze the interest and agree a manageable payment plan with him (they will want to see a detailed Income & Expenditure plan).
With regards to the Mortgage, if this is in arrears, the Bank will eventually evict the occupiers of the property and sell it, to recoup what's owed. The Bank will have a LEGAL CHARGE on the property, which means the property belongs to them. He is likely to lose a lot of money when this happens, as sadly the Bank will sell the house for less than it's worth, if it means their debt is satisfied. This is why Evicted properties are always such a bargain. This WILL happen, albeit it might take a year or two. It's a set process, and Mortgages are NEVER written off. Because the house is a brick and mortar ASSET and the Bank WILL CERTAINLY sell this, to recover what they can. Sorry for the shouting in Capitals, but I cannot stress enough that this is the route that the Bank will go down. I did this for years and I do know what I am talking about!
I wouldn't want joint finances with someone with so much debt (and who is burying his head in the sand about it). I'd just end up liable for his current debt and possibly any future debts he might incur
That's nonsense. The Op cannot ever be held responsible for her Partners debt, because her name isn't on the Credit Card or Mortgage. The Op's Partner is liable, as is any other named person on the debt, OR..... any Guarantors/Third Party Sureties. That said, I wouldn't want a joint account with him anyway.