My name is Mark Smith. I am a former diplomat and policy adviser at the Foreign, Commonwealth and Development Office (FCDO). I spent my career working in the Middle East directorate and serving in the Arab world. As a lead officer on arms sales policy, I was responsible for assessing whether the UK government’s arms sales adhered to legal and ethical standards under domestic and international law.

In August 2024, I resigned over the UK government’s refusal to halt arms sales to Israel amid the bombardment of Gaza. This decision followed over a year of internal lobbying and whistleblowing. My resignation made headlines, and weeks later, the new Labour government announced it would finally suspend arms sales to Israel. While this was welcome, it came far too late. Israel has continued to commit atrocities in Gaza as the UK stands by, unwilling to act.

My time at the FCDO exposed how ministers can manipulate legal frameworks to shield “friendly” nations from accountability. They stall, distort and obscure official processes to create a facade of legitimacy, while allowing the most egregious crimes against humanity to take place. Now, as the US – one of our closest allies – proposes the full-scale ethnic cleansing of Gaza, what will our response be?

What I witnessed was not just moral failure but conduct that I believe crossed the threshold into complicity with war crimes. The British public deserves to know how these decisions are made behind closed doors – and how systemic dysfunction enables the government to perpetuate harm while shielding itself from scrutiny.

As a lead adviser on arms sales policy, my role was to gather information on the conduct of foreign governments involved in military campaigns, particularly regarding civilian casualties and adherence to international humanitarian law. This information formed........

© The Guardian