Thank you again, boguing.
Hmmm
... W10?? Having laboured through the various iterations of Gates's follies since Win2/3, the thought that BG would give ANYTHING away, without an ulterior motive, would stretch my credibility beyond breaking point!!
So, NO W10 for me, thank you. Bluetooth is, for me, an interesting add-on, not an essential and the interest is, now, why an accepted standard accessory refuses to work on just one version of the software - and, more particularly, why neither of the drivers work or can be made to work. Neither the adaptor manufacturer nor MS have even acknowledged the problem, let alone put any effort into resolving it.