Hi Evolution13, thanks for assisting. My car has done just over 45K miles; I think that it had run about 6K when I bought it, if memory serves. Yes, the spark plugs did occur to me; the car hasn't been serviced for a couple of years, since the last service cost me about £700, including a change of rear brake pads and shoes. This huge fuel usage seemed to happen suddenly after I put in the fuel from the independent garage, where I had never been (the Asda fuel replaced that, and I have never had a problem with their fuel, which I have used often; apologies for me confusing folks !). It got better, but now it is using a lot of fuel again. However, today I purchased some copper grease and I'll have a go at freeing up the rear nearside brake to stop the occasional squeaking (and hopefully, the scoring of the brake disk). I have axle stands, so I'll check both back brakes at the same time - if I could just be sure where to position the axle stands without wrecking my car ! Any recommendations of any good videos which might help me with this, please ? Much appreciated !