Preheat the grill to medium. Toast the bread both sides.
In a small pan gently heat the butter, mustard, ale and Worcester sauce and mix together well.
Turn the heat down to low and add in the cheese. Stir until melted and smooth.
Take off the heat and let cool a little, but not enough to let the mixture solidify.
Pour and spread the mixture evenly across the slices of toast, pushing it out to the edges.
Grill under the grill until golden and bubbly. Serve with the rest of the ale.