He served as the first and to date only independent professional Counsel General for Wales, the statutory Law Officer to the Welsh Government, during the governmental term of the 4th Assembly/Senedd.

Upon nomination by the First Minister, his appointment was approved by the Senedd and formally made by the Queen on 21 July 2011, although he had been acting Counsel General from his birthday on 27 May 2011.

He was admitted to Lincoln's Inn as a Hardwick Entrance Scholar and was in 1984 awarded the Megarry Major Scholarship.

In 2016 Huckle was appointed visiting professor of Law the King's College, London and took up the role of General Editor of the Butterworths' Personal Injury Litigation Service.

Huckle appeared for the Claimant Ms Baker in the first case of industrial "deafness" (noise-induced hearing loss) to be considered in the Supreme Court (or its predecessor Judicial Committee of the House of Lords): Baker v Quantum Clothing [2011] UKSC 17; [2011] 1 WLR 1003; [2011] ICR 523; [2011] PIQR P14.

[1][2] The then Presiding Judge of the Wales Circuit, David Lloyd Jones J, undertook the swearing in ceremony on 13 June 2011.

If that contention was held to be right, then Acts of the National Assembly for Wales would similarly be open to judicial review on these grounds.

Accordingly, the First Minister of Wales intervened in the appeal in the Supreme Court in order to make representations on the scope of common law challenge so far as Acts of the Assembly were concerned.

Their Lordships held that Acts of the Scottish Parliament could not be subject to judicial review at common law on the grounds of irrationality, unreasonableness or arbitrariness.

Whilst the case focused on devolved legislation, some of their Lordships restated the possibility that even Acts of Parliament could be challenged where the legislation was such as to undermine the rule of law or fundamental rights (see Lord Steyn's observations in Jackson v AG [2005] UKHL 56), although this remains formally undecided.

The Bill provided for a new mechanism for creation of byelaws but without ministerial approval either in Cardiff or, crucially to the Reference, in Westminster, thus repealing the previous confirmation power of a Minister of the Crown.

789; Times, July 14, 2014 The National Assembly passed this Bill to reinstate a form of Agricultural Wages Board (in an expanded functions form) after the abolition of the AWB across England & Wales by the Enterprise and Regulatory Reform Act 2013, notwithstanding the provisions of the Public Bodies Act 2011 which provided for the abolition of such "quangos" but subject to the consent of devolved legislatures where their legislative competence was engaged.

Huckle again appeared for the Welsh Government to argue that the Assembly does have competence to legislate with respect to employment rights and law provided that the provisions doing so also "relate to" a devolved subject, in this case agriculture.

Reference to the Supreme Court of the Recovery of Medical Costs for Asbestos Diseases (Wales) Bill [2015] UKSC 3; [2015] A.C. 1016; [2015] 2 W.L.R.

Powerful dissents from Lord Thomas CJ and Lady Hale held that the Assembly did have legislative competence generally in the area dealt with, but that Art 1 was indeed infringed by these provisions.

On the minority view it would likely have been possible to amend it in accordance with s114 of GOWA 2006 to make it Art 1 Protocol 1 complaint.