Managed to fit the TWINtake yesterday, once I found a shop that sold a 24mm long-reach bi-hex socket

and I'm enjoying the 'darth vader' noises, albeit quite a bit louder than I thought!
A couple of the 70-90 hose clips / jubilee clips included with the kit didn't seem to tighten correctly (kept jumping threads and wouldn't go any tighter) so I'm going to nip to Halfords today and get a few new ones...
apart from that I'd recommend the kit thoroughly, and don't give up when trying to fit the last canister
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its a right B*stard but you'll get there eventually!