| Postcode | Country | County | Type | Status |
|---|---|---|---|---|
| England | Hertfordshire | Small | Terminated May 2011 | |
| England | Hertfordshire | Small | ||
| England | Hertfordshire | Small | ||
| England | Hertfordshire | Large | Terminated February 2006 | |
| England | Hertfordshire | Large | ||
| England | Hertfordshire | Large | Terminated February 2004 | |
| England | Hertfordshire | Small | ||
| England | Hertfordshire | Small | ||
| England | Hertfordshire | Small | ||
| England | Hertfordshire | Large | Terminated February 2015 | |
| England | Hertfordshire | Large | Terminated April 2019 | |
| England | Hertfordshire | Small | ||
| England | Hertfordshire | Large | Terminated April 2002 | |
| England | Hertfordshire | Large | Terminated December 2018 | |
| England | Hertfordshire | Large | ||
| England | Hertfordshire | Large | Terminated October 2002 | |
| England | Hertfordshire | Large | ||
| England | Hertfordshire | Small | ||
| England | Hertfordshire | Large | Terminated December 2010 | |
| England | Hertfordshire | Large |