I'm also confused as to why many seem to agree it's fair that kids whose parents volunteer to help should be given priority?
If you have parents with the time, skills and motivation to help with D of E, you are already at an advantage, as surely it's very likely that those parents also use their time, skills and motivation to give you other enriching experiences.
Surely it's the kids whose parents can't or won't do this who will benefit most from D of E?
I'm obviously not suggesting those kids should automatically move to the bottom of the list. But not should they be advantaged.
In schools where demand for D of E places outstrips capacity, the only fair ways of allocating places are:
A) lottery system
B) selection process (based on application, references, interview, prior extra curricular involvement, whatever, as long as the criteria are made clear to all involved, and relate to what the child themself does and not their family).
B is in many ways preferable as it gives the kids valuable real life experience of selection processes, but it's a huge investment of time to organise this, so it's not fair to make it an expectation.
I also think it would be reasonable to have a quota in terms of number of students in receipt of FSM, and perhaps gender and ethnicity too if the school currently has inequalities in terms of outcomes for certain groups. I realise that not everyone will agree with me on this.....
Don't get me wrong, I have nothing but respect for parents who volunteer to help with D of E - that's a brilliant thing to do - it's not something I have even considered as a parent, so you are better people than me! But it shouldn't be used as a way to circumvent the school's selection process.