Can anyone advise where I can buy a Heidi inflator

You can't!  They went bust years ago so it is only if anyone is selling one second hand that you might get one but I wouldn't hold your breath - I've not seen one for sale and I'm not parting with mine  

owwwww sorry i ask ... :oops:

You weren't to know but from what I've heard and from what my hubby (who's in the know) says they are probably nowhere near as reliable as the dual split sizers.  

Pam has said they have one but it has bugs! Not sure what they are because the only weird thing mine has done once is to not shut off the gas and I wasted about half a cylinder trying to turn it off.  

My hubby Paul took mine apart the other day to have a look and he said it is overly complicated in ways that we suspect the dss would not be.  He said there are so many add-ons inside that have obviously been added to fix faults when they should have started again.  He also said it is quite flimsy in it's circuitry and it is surprising they work for very long!  Hopefully if mine goes wrong he'll be able to fix it but he says that if it is down to programming then there will be no hope as there are way too many pics and he has no idea how they talk to each other as there are 3 completely separate circuit boards in it.