Stephen Littlechild and other former energy regulators of the UK submitted a written evidence to the BEIS Select Committee on pre-legislative scrutiny of the draft domestic gas and electricity (tariff cap) bill in November 2017. The full text can be found here.
On 12 December 2017, S. Littlechild gave evidence in person during the Select Committee meeting. The written transcript of the meeting can be found here. The meeting can also be viewed here
The follow-up submission to BEIS Select Committee on 18 December 2017 can be found here