OK cool, thanks for that. I got my CVT fluid from Ravenol in Obs, they claim that the Honda stuff is actually manufactured by Ravenol anyway. I've bought some supposedly special snowflake oils for my Jeep from them in the past, so far so good.
I did struggle earlier getting the drain plug bolt out, it just wouldn't budge. The washer was very deformed, I suspect the Honda dealer may have used an impact gun to tighten it last time they did a CVT flush (when I purchased it there was a severe shudder, the dealer I purchased from paid to have a double flush done). Also, the car was standing for almost 2 hours before I tried, so tomorrow I'm going to go for a 20 min drive and then jack it up and try to crack it loose immediately, maybe it was just too cold earlier.