That 1% is on top of previous 2% so it is significantI'd rather they increase all thresholds inline with inflation (and recalculate them from when they froze them) than significantly raise taxes and then cancel a tiny bit of it and call it a "tax cut", nobody is getting a tax cut as long as the thresholds are frozen.
A 1% cut to the basic NI rate (from 12.5k to 50k) is at max about £375 per person per year unless they cut the top rate as well.