The Other Bike's Doctor called this afternoon to advise that the carbs had been cleaned and it now runs beautifully but will only tick over on three cylinders.
The carbs will need to come off and be sent for Ultrasonic Cleaning.
Ho Hum! I suppose it is a good job the Vespa is Fuel Injection!
I'm guessing that it will be a week or more until the Other Bike is anywhere near ready. TP's Leathers may have arrived by then.