Tessa's current seat Dulwich and West Norwood covers an area stretching from east of Brixton Road to the edge of Horniman Gardens and Sydenham Hill. It's seen that a cross Lambeth/Southwark seat isn't working, so as part of the boundary review, a seat which borders Lewisham and Southwark will be more relevant to constituents than the current situation where residents in FH share an MP with those in Penge and those in Dulwich with people who live the eastern part of Lambeth.

The new seat would also mean that constituents who live on the Southwark side of Honor Oak Park would also have the same MP as on the Lewisham side. Currently Harriet Harman is the MP for that part of SE23 as it forms part of the Peckham Rye ward.