Here is the response I have received from the DoE after two months of waiting:
The pathfinder authorities are currently testing proposals in the SEN and Disability Green Paper to offer all families with the new Education, Health and Social Care Plan the option of a personal budget by 2014.
As part of this testing, the pilot sheme for direct payments set out in the Order gives the local authorities the power to test the use of direct payments for special educational provision. The scheme allows any family in a pilot area to request a direct payment when they receive a copy of a new or amended statement or where a learning difficulties assessment has been carried out.
Local authorities named in the Order are required to consider any such request but are not under any obligation to agree it where there are good reasons for them not to do so. Paragraph 11 of the order sets out the considerations that local authorities must make before deciding any individual request.