Thanks - I will try this - Pops
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If your battery is more than 3 years old, is most likely week or bad, it is recommended to avoid problems such as the aforementioned, is to replace the battery every 36 months. When you do the above the alternator/charging system should be tested to make sure no other components went in your foray. What is most likely happening, seems that most likely your battery ventured in what I would call, "the gray area." The battery is not really totally bad, nor totally good!
Your battery is not keeping enough charge during mortor/charging/operation, then in the morning it recuperates, as part of its reserve and starts the car. They can even be full of battery water. Sometimes when batteries are in this threshold, they even test good in meters, with the results you have. If you have another car, that you know the battery is great exchange it and run the experiment, you probably will see no problem starting and running. If you keep running your car as you are doing you will kill the alternator also, since the battery does not keep enough charge at times. it will make the alternator work harder in fact killing it softly. The click is characteristic of low charge, or in some instances the battery connections bad, and also the starter. I would go first testing the battery with a known good one, cleaning the contacts, and last testing the whole charging starting system. If all of this fails then you have some other bad corroded cable, or bad ground, but this is very remote possibility. Go for the obvious the battery and cleaning its terminals, making sure they are tight and free of corrosion.
C. PR
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Battery has been checked again with engine running and returns 11.5 to 12 volts. Consensus of opinion at garages is that the alternator is at fault - that even with a faulty battery, it should reach 14 volts. BUT I'm inclined to agree with contributors here that I should try all the simpler options first. I haven't got another battery. If I buy and fit a new one, it seems to me that I can find out that way. Almost certainly needs a new one anyway. Comments appreciated.