How can I get essay feedback?

Paid or otherwise. On my course I need to do an essay about every 2 weeks. I need to get distinctions but only getting merits with the vague feedback being they don't flow well.

They only level 3 but require full Harvard referencing, I feel like I understand the concepts but struggling to use the right words. The essays are a mix of English/psych/education.

Sounds like you need to improve your essay structure so it's not really that vague. You can get an app to do harvard referencing for you.