| Postcode | Country | County | Type | Status |
|---|---|---|---|---|
| England | Hertfordshire | Large | Terminated May 1994 | |
| England | Hertfordshire | Large | Terminated January 2004 | |
| England | Hertfordshire | Large | Terminated March 2008 | |
| England | Hertfordshire | Large | Terminated July 2015 | |
| England | Hertfordshire | Large | Terminated December 1996 | |
| England | Hertfordshire | Small | ||
| England | Hertfordshire | Small | Terminated December 1999 | |
| England | Hertfordshire | Small | ||
| England | Hertfordshire | Large | Terminated September 2005 | |
| England | Hertfordshire | Large | Terminated December 1999 | |
| England | Hertfordshire | Large | Terminated December 1999 | |
| England | Hertfordshire | Large | Terminated August 2003 | |
| England | Hertfordshire | Small | ||
| England | Hertfordshire | Small | ||
| England | Hertfordshire | Small | ||
| England | Hertfordshire | Small | ||
| England | Hertfordshire | Small | ||
| England | Hertfordshire | Large | Terminated February 2001 | |
| England | Hertfordshire | Large | Terminated March 2002 | |
| England | Hertfordshire | Large | Terminated December 1990 |