Sieve flour into mixing bowl, add sugar and cold beer. Gently mix until well combined.
Heat oil in saucepan on medium heat. Drop a teaspoon of batter into oil. If it floats to the top, oil is ready for cooking.
Using a skewer or fork, prick banana slice and dip into batter until banana well coated. Gently drop coated banana into oil, removing skewer / fork. Once batter is golden, flip over to cook on other side (about a minute on each side). Cook a few Banana Bombs at a time, however, don't over crowd saucepan.
Once banana bomb is golden on both sides, remove from oil with slotted spoon and place on paper towel to absorb any residual oil.
Sprinkle with icing sugar.
Place butter and sugar in saucepan over medium heat and stir constantly until melted. Take off heat and stir in cream.
Serve Banana Bombs warm with ice cream topped with warm Toffee Sauce.