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Scilly.Suffolk
If the cranks came loose, it will keep coming loose no matter how much you've tighten it, meaning new crankset, that's a seperate issues not part of the BB, just poor installation.
Lasco crankset from Velosolo is a cheap replacement.
As for the bottom bracket, get the Shimano UN55, and take it all to a bicycle shop to get it installed and torqued properly, labour charge likely to be between £15 to £25.