Hi partyboy -
I've since received further information from sailing holidays with confirmation of my flight details, and guess what!?
it IS ACTUALLY the second number you quoted - MON3690!!!
so yes you've also resovled my query as well by doing:-
1) explaining the details of the a300 usage
2) quoting both flight numbers
3) and finally, confirming the kit being used!
Thanks everyone for the brilliant feedback
DER to me, who took the presumption I was due to be flying on MON1786