The cost is more like £20,000 (and that was a few years ago). Operators who had funding throug the Clean Bus Technology Fund often provided 10% funding under their bid so this may be where £2,000 has come from. Retrofitting is no longer funded as real world data showed it was doing very little on most buses retrofitted.Converting an Omnicity from Euro 4 to Euro 6 only costs about £2,000.