Thanks for this.
Over Christmas we bought a 2010 1.2 petrol corsa, 15 months old and 15K on the clock, that makes a pronounced tappety noise at idle (audible within the cabin). It only makes the noise when the engine is fully warmed up, not from cold.
It's also been losing coolant from the timing side of the engine, drops are visible on the sump bolts near the crankshaft pulley. I've added over a litre in stages over the past two weeks.
Booked into the dealers next week for confirmation of diagnosis. Judging from the UK Corsa forums, this is a fairly common problem -- lots of water pump replacements on this engine and the 1.4.
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