When I saw the thread title I thought it had collapsed again since the weekend!
This collapse, which the article says the "engineers were quick to react" to, was open for a couple of months with a not inconsiderable void below the road (approx 6ft deep at the roadside and sloping down under the road for 8-10ft) and and an increasingly apparent depression in the road surface. It was pretty much adjacent to (on the crossroads side of) the previous collapse they filled in last February, and may perhaps have been caused by the fact they blocked all the existing drainage when they repaired that one. Over winter there was a semi-permanent large puddle there, often the full width of the road. At the end of March it disappeared when it must have found some new drainage, taking a large chunk of the substructure of the road with it.
The repair this time seemed to include some pipework across to the opposite side, where the ditch has been half filled with stone chippings to provide a different location for the soak-away. Give it another wet year and there could be another sink open up under the hedge outside the Horticultural Works.
Keeps life interesting though, and something to remember when you're sat waiting for the lights to change...