You can have nail polish in every department except for fruit & veg, deli and bakery. The rest of the departments such as online, night fill and grocery, you can have whatever you want, you're even allowed to wear acrylics. Just don't go wild, be modest and you should be fine.
Yes. Not in deli
Yes for some departments but deli and bakery etc has different rules due to food handling
Yes, I had acrylics for my whole employment and nothing was ever said