DH had a huge overdraft, he avoided paying it for 8 months because the bank wouldn't send him a written settlement figure and we were going through financial difficulty. (Also because he's a complete ostrich and muppet about consequence)
We have found our dream home and do not wish to borrow any more from the mortgage company, just port the mortgage. But when we were asking for more they refused on his experian file, the only bad thing is the default.