Weather experts predict temperatures will dip by around ten degrees . Plunge means Iceland will be colder than Moscow , Stockholm and Finland . Arctic airmass from Britain to blame for the sharp change in temperature . Forecaster also predict thousands of runners could be in for wet London Marathon .
Weather experts predict temperatures will dip by around ten degrees . Plunge means Britain will be colder than Moscow , Stockholm and Finland . Arctic airmass from Iceland to blame for the sharp change in temperature . Forecaster also predict thousands of runners could be in for wet London Marathon .