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Related party transactions - Transactions with other related parties (Details) - HKD ($) | 12 Months Ended
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Dec. 31, 2025 | Dec. 31, 2024
Related party transactions [abstract] |  |
Consultancy and management service income | $ 468,000 | $ 468,000
Rental expense | 360,000 | 0
Sales and marketing service income | $ 420,916 | $ 238,328

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- References No definition available. + Details
Name: | ifrs-full_RelatedPartyTransactionsAbstract
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Consultancy And Management Service Income, Related Party Transactions + References No definition available. + Details
Name: | pre_ConsultancyAndManagementServiceIncomeRelatedPartyTransactions
Namespace Prefix: | pre_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Rental Expense, Related Party Transactions + References No definition available. + Details
Name: | pre_RentalExpenseRelatedPartyTransactions
Namespace Prefix: | pre_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Sales And Marketing Service Income, Related Party Transactions + References No definition available. + Details
Name: | pre_SalesAndMarketingServiceIncomeRelatedPartyTransactions
Namespace Prefix: | pre_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration