Piers is the study skills tutor at Pearson College London.  He also teaches on the self managed learning courses and is involved in marking essays. 

He was kind enough to join me for a quick chat about the sort of things that he sees as common mistakes in essay writing.  

Piers mentions his study skills site during this podcast, you can find it here... https://lib-guides.pearsoncollegelondon.ac.uk/library/studyskills