Tip 1: Make sure you get coconut cream that has no additives such as guar gum, agar or emulsifiers. The night before you make the lamingtons, put your can(s) of coconut cream in the fridge. When you measure the coconut cream, only use the thick part of coconut cream that's formed at the top of the can.
Tip 2: A quicker way to coat and decorate the lamingtons is to spread the jam and cream on the sponge slabs in Step 1 of 'To assemble'. Then sandwich the slabs together, cut them into pieces then dip each 'sandwich' in chocolate and coconut.