I've stared at these plaques until I'm cross eyed, trying to work out if they came from one transfer plate. There are subtle differences, but you have to factor in the wear of the copper plate over time, and tiny flaws created during the application of the transfers. The idiosyncratic spacing of the lettering runs through all of them, but also through the 'Southwick' Wesley, which was clearly traced from the same source. My mind is still not made up. The four I own could possibly be from the same transfer plate, but there may be other variants. I've posted pictures of a fine imprint (left) and a degraded imprint (right), so you can compare. Click on the images to enlarge, and to move between them.
Thanks again to Keith Lovell for sharing his research into the following plate. The transfer is of Wesley with 'FOUNDER OF THE' in the title.
So at least some of the plaques with 'FOUNDER OF THE' in the title are likely from the Sheriff Hill Pottery.
Below are three shots of another personalised item with 'FOUNDER OF THE' in Wesley's title. Taking into account the curvature of the mug, it's impossible to say with certainty whether the Wesley comes from the same transfer plate as that on the plate above (click on the images to enlarge). It is, however, marked with a date, 1839, which would put it within the Sheriff Hill Pottery's production period.