Hi Tallulah, welcome to the Forums, I'll try to answer your question according to my own opinion, I'm sure MM will give you a better answer later. Learnt belongs to irregular verbs in British English, though I'd like to add that they were not considered irregular maybe 4 hundred years ago. " is lost now, no longer exist.
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Cairna) I burnt my finger on the stove.I'm with you on this one, Cairn.
b) I burned my finger on the stove.
It feel that a) is momentary and b) almost hurts. (it might be personal, though)