Since the review of local authority boundaries in 2018 the newly created wards of Selsdon and Addington Village, and Selsdon Vale and Forestdale were represented in Parliament by two different Members of Parliament. Broadly speaking if you live at the Eastern end of these two wards you are represented by the MP for Croydon Central, and if you live in the Western end then you are represented by the MP for Croydon South, Chris Philp. This situation remains until the next Parliamentary election, probably a General Election within the next two years.
The boundaries for Parliamentary constituencies have been revised. At the next Parliamentary election the two Selsdon constituencies will fall within the new Parliamentary constituency of Croydon East (map attached).
