When the engine is running from cold, does it smell like fish at the exhaust?
No fish I'm afraid
At 112K your heater plugs will have a good coating of carbon on them and so will not provide as high a temp as they used to.
Btw the cooler temp at night means it is quite normal to see the vapours produced from the exhaust, but if you feel it's excessive then it might be worth having the heater plugs changed.
Don't think I've ever had my plugs changed, I'll check my paperwork from the service and MOT's
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