| Postcode | Country | County | Type | Status |
|---|---|---|---|---|
| England | Hertfordshire | Large | Terminated February 2009 | |
| England | Hertfordshire | Large | Terminated March 2001 | |
| England | Hertfordshire | Large | Terminated March 2001 | |
| England | (pseudo) England (UA/MD/LB) | Small | Terminated January 2017 | |
| England | Hertfordshire | Large | Terminated May 2004 | |
| England | Hertfordshire | Large | Terminated March 2002 | |
| England | Hertfordshire | Large | Terminated December 2002 | |
| England | Hertfordshire | Large | Terminated March 2002 | |
| England | Hertfordshire | Large | Terminated August 2004 | |
| England | Hertfordshire | Large | Terminated February 2006 |