By Benedict Tetzlaff-Deas Freezing sub-zero temperatures are set to strike this week as a new cold front arrives, according to the Met Office. The national forecaster says a change in the weather is expected due to chilly winds coming from the north, pushing away the slow-moving warm front that has kept conditions generally milder over recent days. Current forecasts show temperatures diving below freezing early on Tuesday in northern parts of the UK, with this expected to repeat overnight on Wednesday. Newcastle, Glasgow and Inverness are among the cities likely to see sub-zero nights come the…