Thanks for adding that Paul, Tarpen must have briefly marketed the Turbair in 1967, as both of my 1968 Turbair Tot 2S sprayers are branded Turbair Ltd (Waltham Abbey/Cross), as is the 1974 Series 13B engine I have from a later Turbair Tot 2S. All the literature I have is from Turbair Ltd too.
As for Edwards Bals, there was this Turbair Tot sold a few years ago and another NOS boxed one with the Edwards Bals address on the box (made £245).
Of course it would be nice to see a Tarpen branded one too or even a catalogue with it in from Tarpen.
David