Add eggs, milk and vanilla and mix together with a hand (manual) beater.
Pour melted margarine and stir thoroughly.
Smear your pan sparingly with margarine (using e.g. a paper towel) before baking first pancake and place on medium heat.
Make a stack of pancakes and let cool.
When reasonably cold, spread sugar and roll pankes or spread jam thinly, cover with whipped cream and fold over twice.
Notes
also revealed how the jam he'd use was made from Balmoral plums. "He (Philip) had these plums that he grew at Balmoral that were amazing. Often you'd see him stood there picking these gorgeous Victoria plums," he said. "The Victoria plums in the Balmoral gardens make the best plums – I know it was one of the Duke's favourites."