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A sudden problem could cause a sudden loss of compression.
Just because it was fine yesterday, doesnt mean there cant be anything wrong.
Check plugs and leads like you said, then i would maybe do a compression test just to be sure.
Also maybe CTS aswell? Coil pack?
Just refit my standard battery.
Massive difference in cold starting compared to the racing 25 - Which is now in my room wrapping in a nice blanket :)
O/E battery FTW for me in this weather. Will refit the racing 25 once the weather improves.