>>>and just wondered if anyone knew if the figure to settle was negotiable?
Not a chance! The lender loses money (from interest repayments) when you pay off your mortgage early, so they won't accept anything less than the due amount,
I also hope that you don't have the problems that I did. I gave the Woolwich a banker's draft to pay off my mortgage and waited for them to send me the deeds. I heard nothing for several months until I eventually got a letter from them. I assumed that it was to do with the deeds but, upon opening it, I found that it was headed 'Notice of Intention to Repossess'! They'd managed to mislay my payment! When they eventually tracked it down they then asked me for another couple of hundred quid to pay the interest that had built up during the intervening period. (It was only when I pointed out that their office, where I was discussing the matter, was just a two minute walk from that of the local newspaper that they suddenly changed their minds).
Then, over a decade later, I tried to sell a small portion of my garden to a neighbour only to be told, by our joint solicitor, that the sale couldn't go through because there was still a charge on the property registered to the Woolwich! Since the Woolwich didn't even exist then, I had lots of difficulties getting that problem sorted out!
Just pay whatever your lender says is due and cross your fingers that they don't screw up the paperwork!
;-)