I have the same car/engine, similar age but half the miles. Have to admit I am a bit twitchy about anything not normal (hesitation, little surges in power etc) but you have to remember, there are tons of these cars on the roads, the only stories you hear are the failures, you never hear of the cars that ‘didn’t have a dmf replacement at 50k’ and ‘didn’t need £1200 of injectors’ 10k later 🙂
One tip for the dmf (though sounds like you don’t need it at 125k) is start the car in neutral with foot off the clutch. If you start it with the clutch held down (in gear or not) that can increase the risk of the dmf failing. Squeaky clutch pedal is an early sign of failure, mine squeaks a little but I’m sure its just the pedal itself
Couple of things I’ve done recently:
Clean the EGR valve…it’ll be full of black gooey gunk, specially if you use supermarket fuel. Black smoke under acceleration is a sign it needs doing. Its quite quick and easy, just very messy! You need a can of brake cleaner or similar. Seems to have made the engine run smoother, the car used to hesitate under gentle acceleration occasionally and also do the same when slowing down in gear.
My car also had rust under all the door edges, it got fixed under warranty last month 🙂 I didn’t have any rust under the bootlid or bonnet but many do. If your car is a facelift you might be getting very close to the end of the corrosion warranty, mine is 12 years but at some point they changed it to 6 when the realised there was a problem! http://www.fordmondeo.org/forum/showtopic.php?tid/777309/tp/1/