Thanks for your comments. It really did taste good. If you want to try something similar then have a look at the "Tarte Normande aux Pommes" or custard apple tart given in the book: Mastering the Art of French Cookery by Simone Beck, Louisette Bertholle and Julia Child. I can honestly say that I made the tart first and then, during some late night reading came across the recipe. Having said that I have had the book for almost 30 years and looked at it many times and thus have no doubt that the idea was stored away in the back of my mind.
By the way, I live in Edinburgh. Will you be celebrating Burns Night?
All the best,