Marks & Spencer's technology chief, Rachel Higham, has stepped down less than 18 months after joining the retailer from BT.

Her departure comes months after a cyberattack in April by Scattered Spider disrupted systems and cost the company around £300 million. Online operations, including click-and-collect, were temporarily halted before being gradually restored.

In a memo to staff, the company described Higham as a steady hand during a turbulent period and wished her well. M&S has said it does not intend to replace her role, leaving questions over succession directly.

The retailer expects part of the financial hit to be offset by insurance. It has declined to comment further on whether Higham will receive a payoff.