This is slightly inaccurate.
It is very easy to get on the official TTE (Table Tennis England) under 13/cadet/junior/under 21/senior/veteran ranking and rating lists - just choose an age category and play at least 4 matches in one or more TTE-sanctioned tournaments or senior/veteran British league and win at least 1 match. This will result in an official TTE "tournament" rankings/ratings. There is no size limit on the number of list entries - for example, the veteran ratings list has 645 entries, while the senior ratings list has 1063 entries, and so on.
At present, the ranking/rating database is maintained by tabletennis365.com. Note that in TTE's parlance, a "ranking" list only includes players eligible to play for England while a "ratings" list includes all registered players in that age category.
Additionally, if you play in a local league that uses tabletennis365.com software, then you will have a tabletennis365 ranking - which takes into account all your local league matches plus all TTE-sanctioned tournaments. Effectively, this is the "national" ranking.
Some people, including myself, feel that the tt365 ranking points are a more accurate reflection of a player's level than official TTE senior/veteran ranking/rating points.
P.S.: Apologies to the OP for taking the thread a bit off-topic (but someone on the Internet was wrong
).