I just completed the application process. You have to click on their Mystery Shopping Training program and proceed through 13 pages showing their concepts, methods and how to use the SASSIE system. Then you have to take a 13 question test and the first answer you miss, ends the test.
Once you complete the test, you enter the second phase of the application process using some of the same fields you see with a standard SASSIE application but most of the form is organized with British shoppers in mind, using their terminology, some of which could be confusing to American shoppers. Some of the questions they ask are a little intrusive but you're not required to enter your SSN or EIN information and you don't have to enter your bank information until you have actually completed your first assignment with them.
After you complete the application, you get a message stating that it may take longer for them to process your application than they had originally conceived due to the high volume of applicants.
Time will tell if I actually am accepted. If I am, I will report the results here so others will know.
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One buzzard to another while circling high overhead (paraphrased), "Patience hell! I want to shop somewhere."