My SLT line manager is being totally unhelpful in something. It's hard to give details without giving away identities but suffice to say in this particular situation they are digging their heels in unnecessarily (IMO) and I am not sure what they are trying to prove. I am a bit of a go between in this scenario as the HOD concerned is not allowed to speak directly to this SLT member on the matter and must go through me despite it not being my area of expertise and despite this approach clearing not getting us anywhere. Instead of trying to resolve the issue, said member of SLT is ploughing ahead with their plans regardless of my concerns and is effectively covering their ears and saying I'm not listening. I have been told to get said HOD to 'come up with a solution' but they also refuse as they don't feel it's their job to do this as it's 'the school's problem' (exams issue). I feel like ripping my hair out, going to the HT and saying sod the lot of you.