Sounds like it could well be the front antirollbar mounting rubber bushes creaking, that creak over a "sleeping policeman" is a giveaway. They go on for years like that. If you want to be sure, give em a squirt of WD40 or similar and the noise should go away for a while.
If that is the case, it's only worth considering replacing them if they can be changed without dropping the subframe. There are many GM vehicles where that is necessary to access the bushes and I believe that the Corsa is one such.
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