Cheers, the problem with most fire blankets is yes it's good at suppressing flames but it's not fluid proof and petrol remains fluid until all most burnt off so it soaks through it.there are a few products that are fluid proof but are expensive, I used pyrogel witch is only available in a full roll and cost £5000 a roll so pretty much out the question for most situations,i hope my boss dosent read this,i liberated some offcuts.i then draped normal 1260 degree blanket around. It depends on how you have the tank and firewall as to what product is best,as far as mot is concerned I think ther just has to be a solid barrier between ocupents and tank but I'd rather be safe,if you let me know how it's going and rough size ill see what I have lying around, cover the postage n it's yours