Suction-Trap Sites 2018
| El – Elgin * To be resited during 2018 |
D - Dundee | G - Gogarbank | Ay - Ayr |
| N - Newcastle | P - Preston | Y - York | K - Kirton |
| BB - Broom's Barn | We - Wellesbourne | H - Hereford | RT - Rothamsted Tower |
| Wr - Writtle | SP - Silwood Park | W - Wye | SX - Starcross |