Where have I gone wrong in my working week?

Right OK so if I did start at 15:00 Fri would need to finish by 04:00 on sat morning if that’s the case.

I understand what ur saying but you said I had incurred a 4th redcuded rest Fri but how did I here as

"Mon - 15:30 - 06:15 = 14hr 45
Tue - 15:30 - 06:00 = 14hr 30
Wed 15:30 - 05:30 = 14hr
Thu 16:25 - 03:00 = 10hr 30

tachograph:
Edit: Unfortunately you had another reduced daily rest period on Friday which made 4, that’s where you went wrong.

But why have I have incurred it here as it’s the same as the situation where u said I could have started at 15:00 on Friday.