Just had a look on sports direct. Some bats are listed twice at a different price point (try working that one out)
Ignoring the pricing inconsistencies, from what I can't tell, the V1200 range is graded something like this:
Premier - Kashmir willow
Titan - painted back so lowest grade of English willow
G4 - grade 4 English willow
Hex - no reference to grade but assuming this is the one with the funky shaped handle
G3 - grade 3 English Willow
G2 - grade 2 English Willow
G1 - grade 1 English Willow
G1 plus - grade 1 English Willow again