| Postcode | Country | County | Type | Status |
|---|---|---|---|---|
| England | Outer London | Small | Terminated December 1991 | |
| England | Hertfordshire | Small | ||
| England | Hertfordshire | Small | Terminated March 2003 | |
| England | Hertfordshire | Small | ||
| England | Hertfordshire | Small | ||
| England | Hertfordshire | Small | ||
| England | Hertfordshire | Small | ||
| England | Hertfordshire | Small | ||
| England | Hertfordshire | Small | ||
| England | Hertfordshire | Small | ||
| England | Hertfordshire | Small | ||
| England | Hertfordshire | Small | ||
| England | Hertfordshire | Small | ||
| England | Hertfordshire | Small | ||
| England | Hertfordshire | Small | ||
| England | Hertfordshire | Small | ||
| England | Hertfordshire | Small | ||
| England | Hertfordshire | Small | Terminated July 1995 | |
| England | Hertfordshire | Small | ||
| England | Hertfordshire | Small |