EGR valve became stuck closed on the cars first real trip out, resulting in really poor economy and performance. The Catalytic Converter warning light came on. Initial checks led me to think that the Flexi-pipe had gone & was causing the sensors to error message. Anyhoo get back from Derbyshire & get the car booked in, it is due an MOT in a month so, got that done as well. Mechanic said the warning light was for the EGR Valve.
Next day I pulled the cover off the EGR to reveal that several teeth had been destroyed. Checked the movement of the valve, which seemed ok. SO I rotated the gearwheel by about 10 degrees. And reinstalled. All good.