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 200700; TQ 200800; TQ 300700; TQ 300800 |
| Congested | TQ 100700; TQ 100800; TQ 200900; TQ 300900; TQ 400700; TQ 400800 |