Rubuta ci gaba ga wannan sakin layi - Thomson ya shiga Jam'iyyar Scottish National Party yana da shekaru goma sha shida a shekara ta 1981. Ta zama sanannen siyasa a lokacin yakin neman zaben raba gardama na Scottish
, tare da kamfen na "Ee". An zabe ta a matsayin 'yar majalisar dokoki na Edinburgh West a shekarar 2015 tare da rinjaye na kuri'u 3,210 da kashi 39% na kuri'un; tare da sauya kashi 25.8% daga Liberal Democrat zuwa SNP. "The Sunday Post" ya bayyana ta a matsayin daya daga cikin 'yan majalisar SNP da za a lura da su a sabuwar majalisar. "The National" ya bayyana Thomson a matsayin "numfashin iska mai kyau" a cikin hasken rayuwarta mai zurfi.