Fantastic! Thanks again, Geoff.
I'm such an old Luddite I hadn't realised that Mayhew was available on Google Books. In a way I almost wish you hadn't told me.. there's an awful lot of work stuff I really need to do tomorrow other than reading Mr H.M., and I already know it's addictive!
I haven't yet looked into the list of Old Sarah's tunes - I know some already - but with the library of tune books we have I am hopeful. I wonder if her present Majesty would like to hear the Nat Anthem played on Gurdy... trompette or not?
The Palmer ref to "Cymphan" is really useful too - almost the "symphony" word, then.
I looked on online 2nd hand book lists a while ago & this book was going for £100, so sadly I didn't buy one! This suggests that indeed the gurdy, or Cymphan was here all the time. As you say, it would be surprising if our lot didn't copy Europe in this, when they copied most other things from the continent.
If anyone has more to add it would be very good to read it, please.
Again, Geoff, my many thanks for filling a large gap in for me.