Line a baking tray with parchment and heat your oven to 220°C. Mix the white flour with the bread soda and cinnamon. Sieve them all into a large bowl to ensure the soda is evenly distributed.
Whisk in the sugar, vanilla, cinnamon, and salt, then slowly drizzle in the milk, whisking to combine. Divide the raisin bread between the jars and pour the milk mixture over the bread ...