Mix well the Thunderbird with the Vodka and pour into an empty litre coke/Lemonade bottle. The exact ratio of Vodka:thunderbird can be altered to the creator’s taste. Fridge for at least 12 hours. Donnington Brainstorm is best at temperatures between 2-4 degrees centigrade. If the drink is too cold it will tend to be too bitter; if it is too warm, it will tend to be too sweet. At just the right temperature, it should be light, refreshing, slightly peary and the alcohol taste minimal. Drink (with friends) VERY CAREFULLY…..