Johnson was driving the vehicle involved in the collision while the charge for Tomkins, who was driving a second car, “relates to his alleged manner of driving”, according to the IOPC, which said its investigation concluded in October last year.
Acting Det Ch Supt James Derham said: “Our thoughts remain with the woman’s family and friends, who continue to grieve the loss of her and her unborn child. This was a truly terrible and heartbreaking incident.
“The IOPC have conducted a thorough and complex investigation and we have worked closely with them as their inquiries have progressed.
“It is important that nothing is said that could prejudice the court proceedings that will now follow, so it would be inappropriate to comment further at this stage.”
