Vienetta is still available, but at half the original size! Look in Iceland, Morrison's, Asda etc. I like the mint one but can't have too much at once.
There's a standing joke in our family regarding Viennetta. My mother-in-law, who liked to think she was a cut above the rest (she definitely wasn't but had a good heart) used to proudly announce that we had Vielletta for dessert when we visited. And it's been called Vielletta ever since
Mind you, I'm not always concentrating on the adverts and I've never rushed out and bought something because I saw it advertised on TV
I did once, Callistemon. Many years ago there was a dessert called Viennetta. The advert had sultry music as a hand was seen with a large knife. They cut into the ice cream and there was a very satisfying crunchy sound.
Forced my Mum to buy one and it was absolute rubbish. No crunch sound at all.
The guy cooking on the barbecue has had plastic surgery which means that, although he's portly, with a bald patch and clearly middle-aged from the back, his face now makes him look like a heart-throb model in his twenties.
The guy who asks him about it, from behind, and who then sees the new face, responds with "That'll do" which, as the ad goes onto explain, is a Yorkshire way of saying "That's fantastic!"