Leaving the interior light on over the weekend is enough to drain my battery, it seems. Opening the door, with the window winding down an inch was then enough to kill it completely...the window wouldn't even go back up.
Jump-leads out, making sure to attach the -ve to an earth not the battery, and all was well again.
Had to wind the window all the way down & back up before it would recognise that it needed to move when the door was opened.
The battery has Unipart written on it, but not sure how old it is. Brings back memories of British Leyland, they were based 5 miles from where I was born, and Unipart trucks were a common sight - never inspired confidence in that brand for me!