Advice please - does the petrol ingenium engine have a particulate filter? I've read that some petrol engines, eg VW, do have them. My 250t has felt a tad sluggish the last couple of days and the average mpg has dropped by 25% for some reason. Only reason I can think of is the PF regenerating, or trying to regenerate as I've only done short journey's recently, but there's no icon on the display to confirm anything.