By Ryan Merrifield The Met Office is forecasting “unusual” highs of 16C during a mini winter heat surge that could last for four days. It comes after two yellow rain warnings were issued this morning in the South West and Midlands tomorrow and Friday – with an estimated 20mm of rain to fall. There could also be some snow later today in Scotland. Spokesperson Andrea Bishop told the Mirror there’s been “lots of contrast” and temperatures are “exceptionally mild” for what is normally considered Britain’s coldest month. The mercury, on average, usually only reaches around 7C in February. The villa…