TTS Group (UK) interview questions

Had interviewed and been offered roles at the company before. Hiring manager invited me to apply for new vacancy. HOURS of prep needed to compile a presentation. (I had now done this twice for this company - first time, they offered me the role but then told me hiring was frozen, so didn't start the job). Was not offered the second role, which was more senior. However was asked to supply my presentations - and was chased on this. Think this is a bit cheeky given I'd probably put a full weeks worth of work into both!