Got one in my hot little hands now and it is definitely 55c - sorry to contradict you LimeSlice I'm pretty sure the price of regular stamps went up to 60c about 3 months or so ago.
You could try and send the 45c ones, but I'd think with 10c the diff you may find them returned to any return address or the recipient could be stung for the additional cost (that used to happen once upon a time, not sure if the PO will still do that though).
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