Thanks for that.
The thing was that I could get the € in the new Opera by changing the language/text encoding but it didn't want to retain the new setting as default. I also noticed that there was no choice of English in the language settings i.e. in Opera 6.05 there is a choice of US English and UK English. In the new version it is just English. I'm not certain what the actual problem is but I will keep to this 6.05 version on this machine although I will retain the new version on the others.
Note: I'm not normally here at weekends. I've dropped in to wait for some courier deliveries of films from my recent USA trip.