Some may remember the saga of this a few weeks ago, but here's a summary and update. Ish.
Old Rover went into a local garage to get the sump gasket changed. I'd sorted out all the other oil leaks, which were embarrassing, and an MOT due.
Went into the garage with zero of the problems I'll now mention. Battery good, if a few years old.
As well as breaking a door lock handle ;-) they mentioned the starter had been soaked in oil. They'd steam cleaned the underneath before sorting the sump gasket. Which now is leak free, so good.
On picking up the car, the alternator wasn't charging. Since I live close by, just drove it home. Certainly didn't want to leave it to have them sort it. Voltmeter on the car was showing pretty low volts - around 11.
When I got some time and decent weather, the problem was the warning light wire not connected properly. That sorted. it now charged - but volts showing only 13 rather than the normal 14 or so when running.
And the starter now deciding to not engage on occasion, but its motor running.
Guessed that it would likely be the steam cleaning that the starter didn't like. But it's not easy to remove.
Intending using the car this last weekend, I charged the battery in situ. And the charger didn't change to green as normal overnight - and the volts engine not running still low.
I'm just going to remove the battery and charge it on the bench. And then check with my ATC tester.
But it might well be the battery is the problem with both the faults.
Just why it would be fine before going into the garage and failed there, I've no idea. ;-)