That's really helpful, thanks a lot.
Despite the fact I am running 2.35" I doubt I could feel the difference due a lack of riding skills.
So, I will send i29 back to Wiggle then and upgrade for something fancier later on.
Or maybe someone happy to grab these for £28? I took the last two from Wiggle.
Also, I am going to try set up EN323 tubeless - it looks doable with the right amount of tape.