(5) Exception 2 applies where C (criminal) has a genuine and subsisting relationship with a qualifying partner, or a genuine and subsisting parental relationship with a qualifying child, and the effect of
C’s deportation on the partner or child would be unduly harsh.
That is, where a person has been sentenced to at least 12 months but less than four years imprisonment (‘medium offenders’), deportation will breach the right to a family life if it would be ‘unduly harsh’ on a partner or child of the appellant.
...
“a degree of harshness going beyond what would necessarily be involved for any […] child of a foreign criminal facing deportation.”
This
test was often interpreted to mean that
a judge should implicitly define an acceptable level of harshness that would necessarily be suffered by any child (or partner) if deportation takes place, and then go on to decide whether the child’s hypothetical suffering would in this case exceed that level.
https://immigrationbarrister.co.uk/deportation-and-the-undul...