How do I find out which banks are grouped together?

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With regards to an easy access savings account. I know the FSCS will protect £170,000 for joint accounts. If you had the same amount (170k ish) in 3 accounts how do you make sure the banks aren't linked so you would in theory get overall protection of the large sum rather than if some institutions are linked so the protection would only be 170. Is there a site which lists which ones are own by same bank 
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