I'm located in the US, but here's a site I'm familiar with: http://www.exotic-pets.co.uk/products.php?cat=17
You can give them a try, but the problem is they're out of asian forests. Maybe they'll get some in by request.
By the way, did you email him by this? info@KenTheBugGuy.com
He usually answers them very quickly.
This site has also been recommended: http://www.thespidershop.co.uk/insect/index.php?cPath=50_35
The asian forests also seem to be out of stock, but I'd contact him anyways.
Hey, I also ran a search and found this list of invert dealers in the UK:
http://www.reptileforums.co.uk/forums/spiders-inverts/291096-list-invert-shops-uk-new.html
pretty sweet link