Share 'A new angle to a brick wall'

I have been trying for a while now to find any information on one William George Douglass, who was transported to Australia in 1804 from York (not Middlesex). I hit a brick wall when I tried to find out where he was tried. The searchers found a sentencing sheet, but I have contacted every official source in York and surrounds that I can think of and no body has any info at all. I am now trying to…