I return here red faced and embarrassed. I was on the game today and while in game went to the store degtio. Turns out all the episodes can be downloaded from three. So i have to apologise to IO. However this is the only way to download them and it's really not obvious. Most people would check the psn store only and never think of looking where they actually are.
The crazy thing is a lot of people as seen on their forums will go to their graves thinking they were scammed all because they stupidly removed the option to download them from the psn store normally.
I'm just glad it worked out and I'll have no problem supporting them going forward. I might upgrade to the gold edition when it's on sale and I'll probably get hitman 2 down the line.