Okey dokey. Finally got round to testing this, and if I'm honest I probably have avoided doing so as it hurts to watch a perfectly good blade get destroyed just testing something that should work as advertised.
All testing performed with clockwise cuts.
Checked and double checked the line-up of the base along the centre with regard the blade. Starts wandering within about 60 degrees of the start of the cut, blade torched.
Whilst I've got all of the kit out, I'm not giving up. Checked it all over again thoroughly, moved the pilot hole along the work piece about and inch so as to avoid the original cut, replaced with another new blade, wanders again, sparks, destroyed blade.
Not satisfactory so will be returning the saw on Monday. As others have said, if it can't do it every single time, it's not right. And I'm now down around 5 blades, all killed whilst trying to figure out why it's stopped working - worked fine for ages, but I guess my mistake was taking the base off for another sawing application.
As I've never had to return a Festool item in over 6 years of use, is it an easy thing to do in the UK?