It's standard after the timing belt has been replaced. Old belts stretch slightly and new ones mean the cam vs crank timings are slightly different. As I understand it the phoenic learn corrects for that

Ckem247 said:

I had a similar problem with my 1.2 8v but it turned out to be a ht lead number 4 I think it was

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HT leads can fail after being removed to replace spark plugs. Common on the 1.2/1.4 16v engine.

Does the OP's warning light come on under ANY load conditions over 60? In other words, will it come on if you have your foot to the floor on the accelerator or if you're nearly completely off the accelerator, or doesn't it make a difference either way? Generally, if it's a misfire, it will be worse on very light throttle openings when the mixture is lean. If it does it all the time above 60, regardless what you do with the throttle, I'd be inclined to go for the phonic re-learn before cashing out on new HT equipment.