125²µ/4Β½΄Η³ϊ plain flour
1 level tsp bicarbonate of soda
1 tsp caster sugar
Β½ tsp fine sea salt
225g/8oz strong white flour
1 x 7g/ΒΌoz sachet fast-action dried yeast
butter, for greasing, plus extra to serve
350ml/12ΒΌfl oz whole milk