If you use cyclestore, put in the comments section which valve length you need for your rims. Luckily for me I live in the same town as their warehouse so was able to nip back and swap for tubes with longer valves. Gks are awesome tyres, once I've worn my paselas out I'll be fitting 32mm gks.
I found these two too:
http://www.chainreactioncycles.com/panaracer-gravel-king-road-bike-tyre/rp-prod149455?gs=1&gclid=CPng8sjp984CFRATGwod7UYHOw&gclsrc=aw.ds
https://www.cyclestore.co.uk/panaracer_gravel_king_700c_tyre_with_free_tube-ID_63899?gclid=CJa_l8rp984CFbMK0wod1L8L2A&gclsrc=aw.ds
Cyclestore comes with free inner.