It's been a while since my politics A level, so I may get some of the terms wrong but hopefully the facts right.
As the UK doesn't have a formal constitution, it relies on convention and that parliament is effectively all powerful (under the crown) in that if parliament (encompassing both houses in this context) votes for something it can do it. (As it represents the will of the people and has the authority of the crown (less relevant in the modern day))
Parliament can't therefore lock a decision in such a way that a future parliament can't change because the future parliament is still all powerful.
In practice though this isn't entirely the case. You can make a law like you said, and while a future parliament can break it, it would (probably) look bad on them. But what does that do to stop politicians?
A further note on the previous chain - we go have two houses of parliament; the house of commons is the main one with the green benches that most will recognise. It has our elected representatives (MPs) in and (normally) where the PM is selected from.
The house of lords (red benches, appointed members for life) is generally considered the check chamber. It used to be able to block laws entirely, but I believe lost that power semi recently and it can now be overruled by the commons after 2/3 rejections.
It would be good to know the actual questions asked, it's suspicious how low green/libdems/reform are in almost everything.
Shouldn't a question like this have a neutral midpoint with trust/distrust on either side? This looks like it's penalising parties people are less aware of the policies of.
Edit: oh, it's the bit at the top "which party would you trust most to:"
Naff question really what was the point of including the smaller parties there? Should have just been the main parties for that question or a graded version with all parties.