I haven’t updated this in a while, and I really should have.
I have been intrigued by the number of driving school websites carrying these sheets now – even to the extent that they carry the exact same scanning defects that are on the ones I generated. Coincidence? Or uncredited plagiarism? I’m seeing a lot of the latter these days.
Note that the article below is the original from 2014, and the download file is for the old PSTs if anyone still wants them for some reason.
The new Part 3 marking sheet can be downloaded here. There’s only one, and it is the official DVSA website, so it should always be up to date (or have a link to an up to date version).
The blog gets a lot of hits from people looking for the PST (ADI 26) marking sheets used on the Part 3 ADI test. In fact, this file has been downloaded many hundreds of times, yet I think less than 
half a dozen people have bothered to say thank you (and some websites are carrying ones they’ve apparently pilfered from here, down to the same scanning defects, but not given credit for). It used to be very difficult to get hold of these from anywhere else, and given the graphics work I had to do to clean up the originals, I know that people have got them from here.
Click the PDF image to download the file. It contains all ten PSTs, and they’re full-sized, so you can print them out if you want to.
The PSTs are also given in the Driving Instructor’s Handbook, although much smaller. But you can see what’s on them at least – which is really all that matters.
Just one last word on the “thank you” thing (and the outright plagiarism some people are involved in). If you have anything like the same approach when you start teaching real pupils you may find you don’t stay in business very long.