By Debtcollectors do you mean the debt has been sold from the original bank to a third party?
If so most of them have been sold to a third party e.g hsbc to moorcroft recoveries.
I'll look into this CCA thing, don't know much about it.
I know paying F&F won't do anything for our credit score,
like I said I'm asking will paying it off at a partial amount be any different to paying off in full in the way a mortgage broker would look at it?
Maybe I should just address this with the broker, just was after some advice in here if possible.