I don't if it is this bus lane but on BBC1 London news they had an item about a review of red route signs and motorists being wrongly fined.

The item shows a list of the top locations for issuing PCNs, Stanstead Road bus lane is number 7.

The report also says there is a list of 400 sites where fines are being reviewed or beeb suspended, it was not clear if Stanstead Road was among those being challenged.