Happy birthday Derek.
I have been back to the house where the bees came from and there was a chap there with a chain saw cutting the tree up and loading it in his truck. In the interest of science I wrestled the main part of the nest off of him before it was sawn too. It's the complete bit from the third photo that Craig put up for me. It's yours for measuring testing etc as I said happy birthday.
Now we need some help getting it to you. I am going to bee tradex if you are or anybody on here that's near you we could shuttle it down to you.
The hollow extended another 16 inches below the length of the bit I have but there was no comb that low. Above the bit I have was another 8 inches which is where the comb once started but wasn't in use still. This top end was the same diameter as the main body that I have but it terminated where the tree had a major branch coming out, the one in the photo. This gave the effect that the 'roof' of the nest was almost double thick here as the trunk swelled because of the branch, I haven't explained that well. The nest ended at the junction of where the tree basically split in two, which meant that the roof was twice as big and thick. Hmm might be easier to talk if you don't know what I mean.
Anyway if you want it it's yours, just need to get it to you. It will go in a decent size boot.
Cheers