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Trade and other Receivables, Deposits and Prepayments - Narrative (Details) - HKD ($) | 12 Months Ended |
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Dec. 31, 2025 | Dec. 31, 2024
Trade and other receivables [abstract] |  |
Trade receivables period | 30 days |
Current interest receivable | $ 2,727,000 | $ 814,000

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- Definition The amount of current interest receivable. [Refer: Interest receivable] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Note Expiry date 2027-01-01 -Name IAS -Number 1 -IssueDate 2025-01-01 -Paragraph 112 -Subparagraph c -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2025-en-b&anchor=para_112_c&doctype=Standard -URIDate 2025-03-27 + Details
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Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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

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- Definition Trade Receivables, Period + References No definition available. + Details
Name: | pre_TradeReceivablesPeriod
Namespace Prefix: | pre_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration