Mix the 15g flour with 100ml water and add to the pan. Stir around until thickened.
Season, but be light handed with the salt as you will be adding the bacon.
Stir in the chopped bacon and sweetcorn. Leave to cool a little.
Make The Pastry
Put the 50ml oil and 100g flour in a bowl and add about 50ml water bit by bit until you have a soft dough. If you have time, the pastry will benefit by being left to rest for a few minutes. How to make pastry using oil hints. You need to add the water, otherwise, the pastry will be impossible to roll
Roll out half of the pastry and use to line a flan dish etc big enough for two portions.
Pile in the filling mixture and top with the remaining pastry.
Bake the pie at 180C/160 fan/Gas 4 for about 30 minutes until golden
Meanwhile cook and mash the potatoes and cook the peas.