Thank you Rosie for reply. You provided some great info.
The address was not 'care of', just normal change of address.
I spent a long time yesterday sending various letters and making phone calls.

I really feel betrayed, and just keep thing why would he do this. If he was going to just leave, why would he need an address.

Based on what you said I will get a personal credit report just to be sure.

All mail for him is now being returned to sender as 'not known at this address'

Anyway, onwards and upwards...... Infinity and Beyond