Power system! Service Urgent! Car dead!

[VolvoRob38]

Hi all...

I have had a Reduced Engine Performance message and service due on the dash at start up for a few months, and I was just driving to my lockup when a red message popped up "Power System, service urgent". I continue on to my destination as I was 2mins away. The message disappeared after 1min and replaced with intermittent "anti skid temporarily off" message.

I turn the car off to get what I need from the lockup and had a quick google to see what these msgs are all about, got back in the car and its dead.... completely dead. Not even the buzz of the steering wheel lock when putting in the key.

I have briefly read; alternator, ecm... The battery isnt that old, but I dont drive it very often. Even now, I think this is the first time its been driven in over a week. I work from home so it doesnt get used, and when it does its usually short journeys around my local area.

Im stuck now about 5 miles from home, so will have to come back tomorrow with someone to try and bump it. Aleast to get it to a garage. My local volvo is 1 hour away, so not ideal!

Anyone experienced this before and know what to do?

TIA

P.s. the blue dials in one pic I got from another thread. The others are mine.

UPDATE: my mate just come with his jump leads and we got it started. First time the car died again as soon as we removed the jump leads. So did it again and left them on for a good 5mins and 2nd time it stayed running and I have now driven it home. If it starts tomorrow I will yake it on a long drive to charge it up.
Is there a possability that something is draining the battery? I narrowed the Reduced Engine Performance issue down to either the glow plugs themselves or their power source. I have been meaning to check their voltage for months.

As I dont use the car very often, could something as simple as the car alarm be draining the battery?