The explosion woke me up just after 6am, I thought it was thunder and our windows rattled.
I live just off J9 of the M25 so is a fair way from Hemel Hemstead so it must have been incredible and very very frightening for the local residents.
Sky news are waring people to stay indoors as the smoke contains toxins and there may be a rain cloud of unburnt oil later.
Keep your self and your family indoors Tony and shut all the windows and doors and above all stay safe.