i would have said a Red Mason Bee
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Osmia rufa is one of the first bees you can expect to take up residence in a bee post. It is one of our commonest bees.
This is another bee that causes concern each spring. The red Mason bee nests in all kinds of holes or crevices, frequently in numbers, in crumbling masonry. It's very unlikely that the bee causes much, if any damage to buildings, as it only excavates mortar that is already crumbling. The female uses mud to construct her cells, hence the name mortar bee. She has two special horns on her face that she tamps mud with during nest building.
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