What proportion of insurance premiums are paid out as claims?

I am wondering if any industry insiders can help me understand the costs and efficiency of insurance companies. I am particularly interested in UK insurance, but if you have data for another country, that would be good too.
For every £1 the company receives in premiums, how much do the customers ultimately receive back as payout for claims?
Is there a lot of variation by policy type, e.g. Home versus Car insurance?
Anyone got any info?

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