Cable holds above 1.2100 ahead of U.S. December inflation data at 1330 GMT

1.2100 was last Friday's high (after USD tanked on sub-50 U.S. service PMI)

Bids pre-1.2100 supported GBP/USD on Tuesday and Wednesday nL1N33W0WW

GBP/USD could jump towards 1.2209 if U.S. CPI softer than expected; 6.5% YY

1.2209 was Monday's three-week high (1.2215 is 61.8% Fibo of 1.2446-1.1842)

UK trade union says 100,000 public sector workers to strike on Feb 1