Thanks Joe, That is pretty much what I thought.

It is just that if you design a control board for a Tank MG (most makes and types of which have TWO MGs) why fit only one socket?

I would expect CLARK to say they were limited by space, but they have two sockets for the smoker ( one for the switch and one for the smoker) whereas the IBU2 uses just one socket for the smoker!!
shaun