I found this question and answer, posted on a website dated 22nd April 2010.
Q) Martin Ferris:
"To ask the Minister for the Environment, Heritage and Local Government his plans to bring forward legislation to allow existing local authority mortgage holders to remortgage without triggering the clawback; and if he will make a statement on the matter."
A) John Gormley:
"While provision has been made in the Housing (Miscellaneous Provisions) Act 2009 to allow purchasers under the new Affordable Dwelling Purchase Arrangements to re-mortgage or top-up their mortgage without triggering the clawback, the Act does not provide this facility for purchasers under existing affordable housing or shared ownership arrangements. I have requested my Department to arrange to have the provisions necessary to address this matter included in the first appropriate legislative vehicle that becomes available."