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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
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AFAIK, there's no regulation depth, but 600mm is recommended.
It's also recommended to have the warning tape 100mm below the surface.
@ChainBreaker: Enjoy laying a trench through tree roots. Buy a mattock. And an axe. And a ground clearance chainsaw.
Or just hire one of these bad boys:
Trench digging does sound fun though.