- “Practical and thorough.” (Chambers UK 2021)
- “Well-known for violent crime cases and criminal appeals” (Legal 500 2021)
- “Well-known for violent crime cases and criminal appeals.” (Legal 500 2020)
- “He’s good at working in a team and is very pleasant to deal with.” (Chambers UK 2020)
- “He is very calm, professional and has an excellent courtroom manner.” “Inspires confidence.” (Chambers UK 2019)
- “Highly recommended for a purview of serious criminal matters.” (Legal 500 2019)
- “Mark Heywood KC is a very high-standard barrister, both on prosecution and defence.” (Chambers UK 2016)