the MEI P5 papers are from here:
http://mei.org.uk/apapers. These also have examiner reports.
The Edexcel P6 papers for the induction questions are from here:
https://freeexampapers.com/exam-papers/A-Level/Maths/Edexcel/ but it's just a directory with sometimes unhelpful filenames so not that nice to navigate. Some of the years have examiner reports but others are missing.
There are also 20-30 induction questions from an old Edexcel P6 textbook I found in my school's library. (have scanned it) Many of which are not one of the three standard flavours of induction proofs. (trig sum proofs, inequalities, and so on)
The problem is that all of the resources are all over the place and it's not very convenient - I want to try to organise them so they're easy to navigate. (I'm also planning on making up my own questions for these sets. Did 2 for FS1 but none for pure)