Whisk together the milk and clotted cream and heat in the microwave (or on top of the stove over medium heat) to scalding but not boiling. If using a vanilla pod, add the seeds and split pod while scalding the milk.
If using vanilla extract instead of a vanilla bean add it at this point. Chill the custard very well for several hours or overnight.
The nutritional information provided is automatically calculated by third party software and is meant as a guideline only. Exact accuracy is not guaranteed. For recipes where all ingredients may not be used entirely, such as those with coatings on meats, or with sauces or dressings for example, calorie & nutritional values per serving will likely be somewhat lower than indicated.