Liddell-Grainger chairs the All-Party Parliamentary Group on Energy Studies, Nuclear Energy, the All-Party Pharmaceuticals group, the All-Party Dyslexia group, and the All-Party Tax group, and is also a member of the All Parliamentary Armed Forces Scheme with the Royal Air Force and the all Parliamentary Radio Group. When seen in the House of Commons he sits on the Business, Energy and Industrial Strategy Committee and has previously sat on the Public Administration Committee, the Environmental Audit Committee, the DEFRA select committee, the Statutory Instruments (Select/Joint Committees), the Scottish Committee as well as the Crossrail Bill Committee.