Munt was parliamentary private secretary (PPS) to the former UK business secretary Vince Cable in the 2010 to 2015 Coalition government.
Resignation as Vince Cable aide over fracking
Munt resigned in January 2015 after she voted for a Commons amendment calling for a moratorium on fracking in the UK, which was not supported by the government. In a letter she explained why:
- Today I handed in my resignation after 3 enjoyable years working closely alongside Vince Cable as his PPS in the Business Department.
- I understood the implications of voting against the Government, but with my principles, in favour of a moratorium or ‘freeze’ on fracking, as endorsed by the Environmental Audit Committee’s Report published on Monday morning.
- Even though the Infrastructure Bill passed with the insistence of both the large parties last night.
- I have restated my opposition to fracking today. I am unwilling to compromise and cannot change my opposition to fracking. I will continue to campaign vocally against fracking and as result it is clear that my views cannot be reconciled with the Government on this matter. This evening I tendered my resignation as PPS to Vince.
- I will continue to defend and represent this beautiful part of Somerset, its residents, businesses with all the enthusiasm and energy that I have had since May 2010 when I became the Member.
- My campaign to stop fracking in Somerset continues. 
- Vice chair of the All Party Parliamentary Group on Unconventional Oil and Gas, set up 2013. Munt remained in this position as at 30 January 2015
- Member of Campaign for Nuclear Disarmament
- Tessa Munt, UK Parliament, accessed 10 September 2013.
- "Liberal Democrats beat Heathcoat-Amory in Wells seat". BBC News. 7 May 2010. Accessed 29 Jan 2015
- Wells, accessed 15 May 2015.
- Why I tendered my resignation as Parliamentary Private Secretary, Tessa Munt website, 27 January 2015, accesse 28 January 2015