"As part of the Group’s simplification programme set out in its 2011 strategic plan, the decision has been reached to close Essex House, leading to around 570 role reductions. A further c75 members of staff currently at Essex House will move to our Chelmsford location.
"As with any decision that affects our colleagues, this was a very difficult one to make. We will do everything we can to provide support for both our employees and the local community to manage this transition.
"We will work with our colleagues wherever possible to try to find suitable roles for them elsewhere within the Group."