http://www.alcohol-injection.com/
Can't praise these enough.
Purchased kit off them 2 years ago and just got around to fitting it to find that the progressive controller was faulty. The kit was obviously out of warranty so contacted supplier and explained situation. No problem they say, ship it back we can repair them and will return it to you. The same day they received my faulty goods they dispatched a brand new replacement rather than me having to wait a couple of weeks for their off-site engineer to repair the unit. Can't grumble there.