I went to Heysham again yesterday, but did not realise one of them was a two-axle. Honestly, it's very hard to tell with literal a sea of Gemini parked up so tightly! May go and have a look off work today to see if it's still there and, more importantly, the truck has gone!
Btw there are another 9 AVBWUs at the docks, which no doubt is one of the 2nd batch for KMB.