Many thanks for this. This counts as my first obvious (dumb) question. The product documentation is quite extensive however it was some time ago that I ran Lesson 3 and I did not spend enough time in the analyser section (which at the tail end of Lesson 3).
I opened the E2E Analyser just before I checked your forum and noticed the regression tester that allows compares/does not compares regression testing and some advanced options that look quite comprehensive and allow users to ignore particular tests and insert some preprocessors using XSLT.
I will review through Lesson 3 that gives a walk through of the Analyser in action and re-contact you if I still have some questions however the lesson appears very thorough.