Dear Karl. Thanks a lot for your answer.
You’ve referred to the manual chapter from the British Standard. I am designing to the Eurocode and the chapter there, dealing with Initial design, states the following:
Con you confirm if the initial design for the two-way PT slab is doing what I highlighted here? If stresses exceed those values, it is defining reinforcement according to TR43 chapter 5.8.7. Is it correct?
Thanks, best wishes