MPs are set to quiz government mandarins on the debacle surrounding Gustafson Porter's hugely contentious Diana Memorial Fountain.
The Public Accounts Committee has decided to investigate the fiasco over the water monument, which was closed to the public for huge swathes of this year due to a series of problems.
The MPs will question Sue Street, permanent secretary at the DCMS, and Mark Camley, the Royal Parks' chief executive, next week.
The fountain has been beset by problems ranging from blocked drainage channels to health-and-safety concerns triggered by slippery surfaces.
But a spokeswoman for the Royal Parks said insisted that the officials would emphasise the success of the fountain.
'The fountain has been very successful since it reopened,' the spokeswoman said. 'We had 500,000 visitors between May and September. We're very proud of the way it's been progressing.'
The PAC hearing will take place next Wednesday.