bsaBill - not me I'm afraid. All I see is the poll result, but no means of casting a vote . But never mind, it's not important and I know when to give up.
Re the 6v debate; all my 6v vehicles - including a T20 Ferguson tractor - have stayed on 6v. After all, we're talikg wattage for lights / horns etc, and when using 6v instead of 12 that merely means twice the amperage for the same result. Provided the wiring is suitable, there should be little or no difference. For electric starting there can be a difference, as discharge rate is proportional to battery plate area, and 12v batteries usually have greater surface area meaning, on a tractor (or car etc) you may only get say 200A x 6v compared with 300A x12v. Just when you need more, you get less. But then few our bikes have been converted to electric start and the modern ones (eg my firestorm) are 12v from new.