Telecoms group Cable & Wireless has said it expects to cut up to 3,000 jobs in the UK over the next five years.
C&W is set to slash its customer base
The move is part of a restructuring plan unveiled by C&W, as it refocuses its UK operations to concentrate on fewer but larger business customers.
The revamp aims to cut C&W's business customer base from 30,000 to 3,000.
C&W currently employs more than 5,500 people in the UK. It has about 2,000 staff in Bracknell, plus other sites in Leeds, Manchester, Reading and London.
The company said that it would be reducing its UK workforce to between 2,500 and 3,500 over the next four to five years, adding that 350 jobs would be cut during the current financial year.
In the UK, C&W provides telecom and internet services to businesses and also operates the Bulldog high-speed internet service.
In January, C&W announced it was to split its operations into two subsidiaries - international and UK - and said at the time that the move would lead to job losses.
At the same time, the firm issued a profit warning and said that chief executive Francesco Caio would leave the firm in April after the split took place.
Unveiling the revamp plans on Tuesday, UK chairman John Pluthero said: "Customers are crying out for a better experience from their telecommunications supplier and we intend to give them just that."
C&W said that by concentrating on "fewer, larger customers and reducing complexity in its products, systems and processes, it [C&W] can set new standards for customers' service experience while, at the same time, reducing costs."
After Cable & Wireless bought Energis last year, the company said the merging of that business with C&W UK would lead to annualised cost savings of more than £40m by the end of March.
The firm said that the Bulldog service now had 107,000 users - with 101,000 consumers and 6,000 businesses - who spent an average of £36 each in January this year.