Schedule 3 DESIGNATIONS OF HEAVILY CONGESTED, CONGESTED AND NON-CONGESTED AREAS FOR THE BUSINESS RADIO (ON-SITE LOCAL COMMUNICATIONS SYSTEMS) AND (ON-SITE SPEECH AND DATA SYSTEMS) LICENCES
Original text. Later amendments are not shown.
| Designation of area | National Grid References for 10km x 10km areas |
| Heavily congested | TQ 200700; TQ 200800; TQ 300700; TQ 300800 |
| Congested | TQ 100700; TQ 100800; TQ 200900; TQ 300900; TQ 400700; TQ 400800 |
| Non-congested | All National Grid References for 10 km x 10 km areas other than those designated as heavily congested or congested |