I got it as well Gary.
Only had a brief glance, not read it through properly but it looks like the same sort of thing as Allergy shield from Ashbys that I use to do.
Had one specific enquiry in a number of years asking for it, and that job led to trouble, so stopped advertising it.
Not sure if there is a market for it out there that I didn't tap into, but don't think I will be trying again.