| Postcode | Country | County | Type | Status |
|---|---|---|---|---|
| England | Hertfordshire | Large | Terminated July 1995 | |
| England | Hertfordshire | Small | ||
| England | Hertfordshire | Large | Terminated November 2001 | |
| England | Hertfordshire | Small | ||
| England | Hertfordshire | Small | ||
| England | Hertfordshire | Large | ||
| England | Hertfordshire | Small | ||
| England | Hertfordshire | Small | ||
| England | Hertfordshire | Small | ||
| England | Hertfordshire | Small | Terminated July 2021 | |
| England | Hertfordshire | Small | ||
| England | Hertfordshire | Small | ||
| England | Hertfordshire | Small | Terminated December 1991 | |
| England | Hertfordshire | Large | Terminated December 1998 | |
| England | Hertfordshire | Small | ||
| England | Hertfordshire | Large | Terminated July 1997 | |
| England | Hertfordshire | Large | Terminated July 1995 | |
| England | Hertfordshire | Large | ||
| England | Hertfordshire | Large | Terminated January 2001 | |
| England | Hertfordshire | Large | Terminated June 1997 |