Defence technology group QinetiQ said its unionised workforce has approved changes to terms and conditions of employment proposed by the company.The union ballot indicated that 75% of those who voted were in favour of the revisions. The agreed changes now come into effect, including the pay increases offered to employees as part of the new package."Whilst this is only one step in a two-year journey, and it is too early to quantify the impact, this agreement was integral to our plans announced last month and will enable us to strengthen our UK business. Our priority is to ensure that we retain the right expertise, flexibly deployed, to help customers to derive value for money from their defence and security programmes," said Leo Quinn, chief executive officer of QinetiQ.