Typically suspicious people thinking that the PPL school is out to sting them...
What is it with some people?
I used to include 2 'progress checks' in our club's PPL course, but the hours total was still the same. One (PC1) was flown just after circuit consolidation to make sure that a more senior FI had independently checked the student's progress and that no bad habits/person foibles had been picked up from the FI.
The other (PC2) was flown during the Nav phase immediately before the students first 'unseen' solo cross-country. Again with a senior FI and for the same reasons as PC1.
Neither PC1 nor PC2 contained any extra instruction, they were the 'student sampling' and 'progress checks' the CAA used to recommened. Perhaps they still do? Because they were termed 'progress checks', if flown with an FE than that didn't then disbar the same FE from flying the PPL Skill Test with the same student - although that sensible rule has now been changed.
No-one is trying to rob you, these are just sensible practices to ensure that progress is independently reviewed.
So I suggest you straighten up and fly right!