Right there in the House of Commons itself a damning report by the Work and Pensions Committee, on policy beyond the Oakley Review, attacked the current system of sanctions in March and recommended 26 urgent reforms, ways in which the Conservative party were told to "clean up" the system in this article in the Mirror. Really all sactions should be aimed at point 17, those people "with a bad attitude". The article states that employment services professionals believe themselves, assumed to mean both in JobcentrePlus itself and associated training providers (I used to have conversation to that effect with the people where I did the "Flexible Routeway"), that such strict conditionality and sanctions are only necessary with that small minority of claimants outright refusing to work and with "history of poor engagement with employment support". The article rightly higlights the need to protect "more determined jobseekers and the vulnerable", as my own experience of being a determined jobseeker making a lot of applications and simply not being the first choice of employers.
Here's the Parliament Publications PDF link itself, and it is interesting to see just how many of the committee are even from the Conservative party, just a shame they can't see the sense to make one of these the secretary of state.