Honestly, the juice is a competitive market. Brands compete in marketing, which means branding, naming and packaging.
If kids want them they will get them. It's not like teens can't get a 6-pack and a few joints.
Plain packaging would be a nightmare local shops. Can you imagine a massive wall with hundreds of flavours in identical packages, it would be like walking into an apothecary.
They could high the liquid from plain sight, but again the variety makes this difficult. Vape should could have an age restriction. I'm not sure if 0 nic juice has one.
It could be worse though, with an attempted ban on non-tobacco flavours.
The reality is the government and the NHS have a choice. Push vaping as a healthier alternative or regulate it like tobacco.
The interesting thing is the shisha isn't regulated in the UK.