Here's an update! You can 'fix' a delaminated bat...
So I took the bat to roger at after I had removed the scuff sheet and stickers. It was a fairly simple job, give it a sand down and then lift the delaminated section up and then feed some glue down it which was kept pressed down by a grip and edge tape.
The glue wasn't watered down at all, as the glue didn't reach all the way down the delaminated section however I'm more than happy with it as the majority of this section doesn't sound hollow anymore and all of the cracks have been glued up. Used the bat last night for the first time and it was going well, certainly worth the work to bring this huge bit of wood back to life.