In Rainham there was originally a Tesco store in the Rainham precinct but in 1994 a much larger store was opened on the Bowaters site at Rainham Mark. This has become a Tesco Extra in the late 2000s.
When the Tesco store opened at Bowaters there were concerns that it would mean the demise of the central store in Rainham so Tesco were required to guarantee that it would remain open for a period of time. This has now long expired but the store in Rainham Shopping centre is now badged as a Tesco Metro and trades on convenience and location.
As a result of the 2 stores in such close proximity there is a local naming convention with Big Tesco and Little Tesco - the Tesco Extra is known as the Big Tesco.
Tesco Extra Rainham/Gillingham - Bowaters Rainham Mark