| Postcode | Country | County | Type | Status |
|---|---|---|---|---|
| England | Hertfordshire | Small | ||
| England | Hertfordshire | Small | Terminated January 2016 | |
| England | Hertfordshire | Large | Terminated January 2002 | |
| England | Hertfordshire | Large | Terminated December 2011 | |
| England | Hertfordshire | Small | ||
| England | Hertfordshire | Small | Terminated February 2011 | |
| England | Hertfordshire | Small | ||
| England | Hertfordshire | Small | ||
| England | Hertfordshire | Small | ||
| England | Hertfordshire | Large | Terminated August 2012 | |
| England | Hertfordshire | Small | ||
| England | Hertfordshire | Small | ||
| England | Hertfordshire | Small | ||
| England | Hertfordshire | Small | ||
| England | Hertfordshire | Small | ||
| England | Hertfordshire | Small | ||
| England | Hertfordshire | Small | ||
| England | Hertfordshire | Large | Terminated March 2017 | |
| England | Hertfordshire | Small | ||
| England | Hertfordshire | Large | Terminated December 1998 |