Schedule 4 HEAVILY CONGESTED AND CONGESTED AREAS FOR ON-SITE PRIVATE BUSINESS RADIO LICENCE
| Designation of area | National Grid References for 10 km × 10 km areas |
|---|---|
| Heavily congested | TQ 250750; TQ 250850; TQ 350750; TQ 350850 |
| Congested | TQ 150750; TQ 150850; TQ 250950; TQ 350950; TQ 450750; TQ 450850 |