Soil type?
A mixture of the normal London clay soil you'd expect and the sort of modeling clay you used at school.
Sounds like the hole would need to be deeper still. Can you buy dwarf weeping willows I wonder..?
You can buy what are claimed to be dwarf weeping willows, but I wouldn't if you value your foundations. They're also sods for surface rooting and popping up all over the garden if a section of root gets severed.
@ColinTheBald started
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Soil type?
A mixture of the normal London clay soil you'd expect and the sort of modeling clay you used at school.
Sounds like the hole would need to be deeper still. Can you buy dwarf weeping willows I wonder..?