I live in London, England and would like to know if it is legal or frowned upon to whittle in parks.

Thanks

You'd need to be aware of knife laws, and ensure you don't break those.

Otherwise; whittling is not illegal in itself.

You would almost definitely be cautioned for doing it, for the use of knife in a public place. You would also lose the knife.

It's fine if you want to spend a night in police cells.

Having a knife in public could be a problem

Yes, you can also piddle in the pond.