Gave her a big time service. Diff oil can't have been done for some time as it was like tar, had to flush the diff a few times to clean it all out. Rear calliper pistons were seizing, so freed them off. Replaced coolant too (plus wash the sludge out of the rad) as it was so diluted was only rated for about -7c, which isn't good enough for these parts, when over the last two winters it has dropped to around -25c.
I hope the many pounds of oils, fluids and filters will improve some of the sluggish when cold issues.