@smilley792 Was correct, these bats were made in Nottingham....
and were indeed made by GM, he was also right with his grading guess. All the bats are graded as original/grade one, which tbf did surprise me a little. I've seen an 808 with the same sort of grain structure as the bat second left, as well as the 808 picture on their website looking similar. As someone has mentioned it comes down to whether people like heartwood or not and i'm not particularly fussy.
All 4 seem to tap up well and sound the same except for the far right bat which seems just a little bit better.
Thanks for the replies guys was interesting to read them