Thank you all for you replies - much appreciated.
We do have one 'Electronic ticket' and one booking reference for both of us and our four flights. We booked this last April and two flights - the Chile>Paris>LHR legs keep changing, insofar that Air France send us an email to say the flight is cancelled and it is then replaced by another flight leaving a few minutes later or earlier but the flight number remains the same as the original flight. So, some of the information on our 'Electronic ticket' is out of date from a scheduled time perspective.
Given that the flight numbers remain the same and only the times are changing by 10/15 minutes - perhaps as you might expect this far out from the actual flights, does the team think I should be contacting AF and ask for a new 'Electronic Ticket'? I think I would be jumping the gun somewhat and should just leave everything as it is.