Grilled Cheese Sandwich

For The Bread
500 g strong flour
1 tsp salt
7 g dried active yeast
350 ml luke warm water
1 handful extra flour
For The Sandwich
1 knob salted butter, softened
1 heaped tsp english mustard
75 g mature cheddar
75 g gruyere
1 pinch dried or fresh oregano
1 dollop chutney to serve