Hi all,
Thank you so much for all your replies and info. I went to speak to the company, which I will now name as Denby, and spoke to the guy who's been looking after me. Turns out we had a bit of crossed wires. I think when I first mentioned sound deadening to him, he presumed it to be over and above their 'standard'. I.E. doing the cab/making it an audiophile's dream.
He showed me round the garage n showed me conversions in progress etc stating that their insulating process is "2 step: first we stick down this metal bubble wrap" where he showed me what can only be described as noise deadening material
So after all that and all my worries, it's all sorted. False alarm I guess. But the fact that I could go down and talk to them, walk around the garage, touch n feel the materials, all that really sets my mind at ease. So big up to Denby