Hiya!
Google tells me that Gatineau are owned by Revlon and both websites has that in their lists, so try the batch code under that?
Alternatively email the company and ask how to work it out - due to a ‘collection’ of ultrasun I’d bought from Q, I wanted to make sure I used everything in the right order and they were actually really helpful! (I’ll have to trawl through my emails to find that info and will post it another time).
Hope that helps - nothing to hand to test my theory so let me know how you get on. Xxx
PS: it was actually a list from this forum in 2012, so therefore must be correct lol!