David
Many thanks for all your advice, but this is a bit too much for an old paysan in the wilds of Normandie, particularly on a Saturday night, after a day of “gilet jaune-ing”. I’ll have a look at compressing the files further tomorrow, but in the meantime I’ll pass the problem to the President; no, not Macron nor Trump, but Bernie!!
Bonne soirée
M
Martin Nicholson