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Thanks for the reply. After 24 hrs, the battery measures 12.8 with the ignition switched off, 14.6 when idling and 14.4 when revving...... Is it normal for the reading to drop when revving?!?
Battery seems to be in top shape. As the last check - turn on the ignition, but don't start engine. Switch the lights to high beam and measure voltage. If it stays above 12V (like 12.2-12.3) your battery is in perfect health and you should check your Optimate.
Yes, it is normal to voltage drop when revved. Triumph regulator is shunt/SCR type and that's how they behave.
 
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