depends where he is, I've seen sativas do well in Devon or Cornwallbad choice westy. You are in uk and your trying to grow a long season sativa , get some indica and research better next time.
Theres been a few successful uk outdoors grows on here. We've had Warmer years recently. Although you're always gonna need to pick a hardy strain I imagine as we're shit and coldwhat part of the UK do you live in that you think you will be able to grow outdoors? Must be the south, like Valencia lol (i know Valencia is in Spain), no really, I live in ENgland for 11 years and unless there has been some major climate change I wouldnt waste any money on seeds from attitude, just put some bagseed in the ground and see if it works, my guess is not enough sun, heat, and its far too wet even if you were in Devon or Cornwall.