I heard a rumour that an outdoor shop is trialing a chamber in store where they will recreate weather conditions (cold, wind, rain etc) so you can try out gear in more realistic circumstances
Not sure about the UK, but I've seen this in the Globetrotter Munich Store. The link below is to a video of it in demonstration - youtube.com/watch?v=brAsvWxXJ1U&
Hopefully they're in the UK as they're pretty cool!