Considering the width and length, a rough back of the fag packet estimation puts the cost at removal, disposal of chippings, resurface, re-install lights, lining at circa £1.5M. Maybe a cool Mil. Then depending if the contractors can fit it into their schedule.
So, first, someone has to stump up the cash. Sorry, no cash, that attracts those who lay your drivaeway cheaply.
Second, contractor scheduling. There's not many approved contractors on the MoD list for runway surfacing. And given the cost it may have to go to OJEU for tending.
I'll place my bet now, as for return to cadet flying, around middle-late 2018.