Other than the absolute normal scenario, different licensing authorities and different insurers are likely to take different approaches to stuff like this.
For example, some insurers will allow food deliveries under a standard taxi or private hire policy, while others won't, or will require a totally different policy, and/or an add-on. After all, it's up to insurers what they'll insure, and how they charge for it.
And it doesn't surprise me that some licensing authorities will say that a taxi or private hire vehicle can't be used for other business purposes. But I'd guess that in reality it's none of their business, pardon the pun.
But if some councils don't allow alternative business uses for plated vehicles, then I'd guess they're acting outside their powers under the legislation. So that might be challengeable in court, but obviously doing something like that is a challenge in itself, so people like yourself will just accept what the council says, and they'll never be taken on.
I'd have thought that there might have been legal challenges regarding that sort of stuff in the past, though, and thus decided case law that would either confirm your council's case, or enable you to take them on maybe without going to the length of a formal legal challenge.
But if Sussex isn't aware of any case law, then if any cases
have been decided on this then presumably they aren't too high profile
