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Not when you find it should be 600mm deep (possibly 1m as the regs might have been updated).
You can wind up future owners of your home by going to town with the caution tape (buried a few inches below the surface): https://www.tlc-direct.co.uk/Products/FMPT103.html
Get it done properly. Let me know if you want help digging the trench to save on labour costs.