I have used Amul fresh cream here. Thats the reason for the slightly softer scoop consistency that you see in the pictures. You can use any dairy or non dairy cream of your choice. Heavy or whipping cream will give you much firmer ice cream and more standing power (have tried this!)
To whip your cream , remember : Chill your cream for few hours. Chill your beaters/ whisk and bowl for atleast 15 minutes (in the freezer section works too) . Use a metal bowl. Start beating at medium and then shift to high after a few minutes.
Increase the amount of Horlicks for a stronger taste. Add as little milk as needed to dissolve it.