Britain is set to be colder than Iceland next week as temperatures plummet to -6C in another cold snap. Forecasters suggest high pressure could be blocked from the UK which will see “cold air masses” – causing temperatures to rapidly decrease. Cold air is expected to move south from Greenland bringing sub-zero temperatures and heavy snow fall. The latest weather maps predict that daytime temperatures will drop to as low as -6C on Monday, February 5. The cold snap comes just days after forecasters suggest snow could blanket most of Britain. Conditions across the UK will largely be colder than R…