(Telecompaper) BT has announced a further investment of GBP 50 million to make fibre broadband available to over 400,000 additional premises in more than 30 cities over the next three years. The company is investing more than GBP 3 billion on deploying fibre broadband, with its open access fibre network already passing more than 18 million premises. This new investment will focus on three areas: enabling city cabinets that were not part of BT's original commercial plans due to technical challenges or local planning restrictions; deploying fibre to cabinets to serve multi-dwelling units such as apartment blocks; and laying further fibre including 'Fibre-to-the-Premises' (FTTP) technology to new build sites in cities.