Hi Martin,
How much use do you give your car? If it's used only very occasionally or for repetitive short journeys the chances are that your battery is discharged or has failed.
If your booster has a charging function, use that to charge your battery for 24 hours minimum, then try again.
If your booster doesn't have a charging function, invest in a smart charger. They're a very useful tool.
If, after charging, the same symptoms are produced, renew the battery.
You don't need an MG specialist for this problem. Any competent garage should be able to make the correct diagnosis.
Simon
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"Whatever is rightly done, however humble, is noble."
Sir Henry Royce.
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