On 6 September the Law Commission published its final report and recommendations on reforms to the Arbitration Act. The full report is available here.
Below follows a non-exhaustive summary of some of the key changes:
Statutory Rule on Governing Law of an Arbitration Agreement
English law has developed common law rules to determine which law governs an arbitration agreement. These rules were summarised by the UK Supreme Court in Enka Insaat ve Sanayi AS v OOO Insurance Company Chubb  UKSC 38, and largely confirmed in Kabab-Ji SAL v Kout Food Group  UKSC 48. Broadly speaking, absent an agreement to the contrary the choice of law of the main contract would also apply to the arbitration agreement.
The proposed new Section 6A would alter that framework for agreements post-dating the new Act becoming law. The new Section 6A still recognises the parties’ positive choice of governing law in the arbitration agreement as determinative. Failing such choice, however, the law of the seat will be applied as the governing law.