Thought I would take a punt at that us one since I bought the stuff for it anyway but the mix didn't come out as thick as his video. Probably due to conflicting us to uk measurements but I'll give the other a go at the weekend.
Doesn’t look too bad that, a tip with lemon drizzle, leave cake in the tin when you drizzle it, I use a carving fork put holes all,over it then pour over, can leave to cool in the tin after it absorbs all that icing saves it going everywhere.