Shares in RPS Group tanked 27.05p or 13% to 181.2p as the energy consultancy business pencilled in a £20 million write-down in the wake of the oil price slump and the impact on its clients.
Delays to its crucial definitive feasibility study for Sirius Minerals, which last year was granted approval to dig potash for fertiliser from the North York Moors National Park, sparked a rush for the exit as the shares slumped 1.55p or 11% to 12.45p.