5.33 In GCHQ's view, even with the benefit of hindsight, any of the possible approaches to achieving new accommodation would have incurred high technical transition costs, and that this cost was therefore unlikely to be a significant factor in deciding between the two options. It has said that the number of staff working at GCHQ has risen since the size of the new accommodation was finalised, in part due to changes in customer requirements after the events of 11 September 2001. Availability of staff accommodation on the retained Oakley plot 2 has given it extra flexibility without requiring a significant expansion of the new accommodation. GCHQ now plans to accommodate some 200-250 staff on Oakley plot 2 up to 2008 by which time it expects to be able to accommodate them in the new building by capitalising on the new and more flexible ways of working offered there.