The UK Government has voted against the footwear anti-dumping measures on every occasion since the were introduced late 90s and been defeated. The UK Govt is not alone voting against them. It is around a 65/35 split.
As a test of whether we have had a genuine Brexit or not, the removal of such duties gives a clear indication that we have control of our own trade policy.
DT is right. We have hardly any factories left, but the ones we have would not be affected by the removal of anti-dumping duty.