This is the cheapest I could find this particular model from all of the regular retailers. This is the same price as the regular dual fan model posted last week.
The Jetstream model is normally priced at £380. It would appear that the prices of the Dual and Jetstream have been switched around on Scan.
Both models have the same clock speed, but be aware that the Jetstream is more chunky, taking up the best part of 3 slots, compared to the 2 for the Dual. However, you do get a few more features, better cooling, quieter running and, most importantly, a light up Palit logo on the side!
Considering that this price is the cheapest any Palit 1070 card has been so far, and with this being a slightly more premium model, this is definitely the one to go for.
EDIT (thanks for the reminder bobo53): NVIDIA also have a promotion running on their newer graphics cards. Scan are one of the retailers taking part, meaning you get $115 in game credit with Paragon, a free-to-play MOBA from Epic Games. More details here: https://www.scan.co.uk/shops/nvidia/gtx-paragon