Why bother! The Herc can carry 20t and the C17 closer to 50t. You don't have to suck it to the ground and/or burn precious gas keeping it on the ground. No need for a mast like the 10 tonner. They can both land on rough strips and get there at 2x and 3x the speed. They're not a complete 'sitting duck' like a blimp and they are a lot smaller in size to spot than a blimp as well.
So 5-6 days manned - wasn't that what BAESYSTEMS came up with their dabble with airships in the 80s/90s. That's progress then!!!
I'd rather throw the £400M at capabilities that stand a chance of actually making sales for the UK rather this croc of 'snake oil'!
LJ