| Postcode | Country | County | Type | Status |
|---|---|---|---|---|
| England | Hertfordshire | Large | Terminated October 2003 | |
| England | Hertfordshire | Large | Terminated September 2005 | |
| England | Hertfordshire | Large | Terminated May 2001 | |
| England | Hertfordshire | Small | ||
| England | Hertfordshire | Large | Terminated February 2004 | |
| England | Hertfordshire | Small | ||
| England | Hertfordshire | Small | ||
| England | Hertfordshire | Small | ||
| England | Hertfordshire | Large | Terminated January 1995 | |
| England | Hertfordshire | Large | Terminated January 1995 | |
| England | Hertfordshire | Small | ||
| England | Hertfordshire | Small | Terminated July 1995 | |
| England | Hertfordshire | Small | ||
| England | Hertfordshire | Small | ||
| England | Hertfordshire | Small | ||
| England | Hertfordshire | Large | Terminated December 2001 | |
| England | Hertfordshire | Large | Terminated December 1992 | |
| England | Hertfordshire | Small | ||
| England | Hertfordshire | Small | ||
| England | Hertfordshire | Small | Terminated December 2010 |