So new battery arrived yesterday, gave it a charge overnight and fitted it this morning. Also checked all the cables to and from battery to make sure everything was good.
Let's just say it made a difference straight away, doing the window resets the windows went up and down the best they ever have, the dash lights look brighter and it seemed to start better. I have also removed all the non standard wiring and the headrest screens, yet another bodge job but slightly better bodge than the towbar electrics, no scotch lock connectors
![Wink ;) ;)](data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7)
Got two replacement headrests on the way.
Will now need to wait for a few days.