Does anyone know where to get...?

You could try Whole Foods there are a few in the UK or here is a recipe that I have actually made..

Pasta

1 3/4 c Flour

1/4 c Cocoa powder

2 Egg

4 T Water

Champagne Cream Sauce

6 Egg yolk

1 c Sugar

1 1/2 c Champagne

Directions:

Mix flour and cocoa well. Mound on your work surface or in a large bowl. Make a deep well in the center of the mound and break the eggs into it. Beat the eggs in there with a fork, adding about 2 Tbsp water. Using a circular motion, draw the flour and cocoa into the center. Toss in another Tbsp of Water. Stir with your fork until all the flour is moistened. Add a little more water as needed. You're gonna have to finish mixing by hand. Pat the dough into a ball. Clean off your work surface, and flour it. Knead the dough for about 10 minutes, or until the dough becomes silky and elastic. Cover the dough and let it rest for half an hour so the gluten can activate in the flour. Roll out 1/4 of the dough at a time, the same way you would any pasta. This will make 4 to 5 cups of cooked pasta---plenty for dessert.

Serve in wine glasses with the following or a warm raspberry sauce and chilled whipped cream.

Champagne Cream Sauce:

Combine yolks and sugar over a double-boiler. Whisk constantly for about 10 minutes, until the mixture begins to thicken. Before it turns to a thick custard, pour in the room-temperature champagne all at once. As it foams up, whisk lightly, and continue to stir as it thickens. Remove from heat.