Despite securing the funding over four years ago, the board has failed to carry out work on the pitch.
GAA president Christy Cooney and overseas chairman Joe McDonagh travelled to Ruislip recently to question the lack of progress and stipulated the funds will now only be released after London raise €300,000 of their own finance to match the GAA’s commitment.
A further €300,000 in funding is also believed to be available from the Irish Department of Foreign Affairs.
However, a proposed fundraising committee has yet to be set up.
But with a new County Board chairman to be elected at Sunday’s Convention, no progress is likely until the new year.