That would be an incorrect assumption - Agreements/Treaties last for (an agreed) fixed term, or until superseded by another Agreement/Treaty.
If any country (
not just the UK) decided that they could abrogate International Agreements when they wanted to, the Agreements/Treaties would be worthless, so why would any other country sign any Treaties or Agreements with that county?
Here is the UKG "Future Relationship" document -
https://assets.publishing.service.go...ith_the_EU.pdf
A couple of points it makes are
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6. The parameters for that future relationship are set out in the UK / EU Political Declaration of 17 October. As that Declaration makes clear, a Comprehensive Free Trade Agreement (CFTA) should be at its core. This Agreement should be on the lines of the FTAs already agreed by the EU in recent years with Canada and with other friendly countries
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Quote:
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83. The Agreement should include provisions for governance arrangements that are appropriate to a relationship of sovereign equals, drawn from existing Free Trade Agreements, such as those the EU has with Japan and Canada
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Each of those treaties took around 7 years, and they didn't have anywhere near the amount of Services to trade as the UK does - the UK is stating it has to be done by the end of the year.