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Their reply:
"As the Langster Pro is a track race frame, it does not have a hole for a front brake in the fork. The standard Langster does have a hole in the fork, but it is designed for road use rather than track race and so has a different geometry which may compromise the Pros handling. I would suggest searching for an aftermarket fork to suit that is compatible with a front brake and going from there."
Any road bike fork with a straight steerer would be fine, the Langster fork rake is 45mm which is actually more than some road bikes. Even if specialized would sell you a fork, it'd probably cost you an arm and a leg.