The tickover will only be perfect when the engine is properly hot, but the symptoms you describe are consistent with the tickover being set incorrectly and the throttle balance and TPS adjustments are suspect too. The spark plugs may not be in good order, but it's hard to say from here, and as the bike was recently serviced I doubt that they're knackered, even if they weren't replaced they should have been checked/cleaned/gapped.
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Originally Posted by KMB
During those 12 weeks the bike was started a couple of times and left to idle for a few minutes.
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Originally Posted by KMB
only start the bike up and move it forward and backwards in the garage.
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Originally Posted by KMB
I rode it about for a few minutes.
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Originally Posted by KMB
Does anyone have any ideas or suggestions?
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Yes, don't do any of the above again, it pretty much guarantees plug fouling, which is the black sootiness you found on the plugs. Clearly it is sometimes unavoidable, but as a general rule do not run the engine unless it will be brought up to full temperature. Clean and gap the plugs, then check or have checked the above areas.