Contact your insurance to see if you are covered or if they would have covered you. the police are hving a crack down on insurance for food deliveries and indeed deliveries of all sorts. If you are doing any of that on a regular basis, whether aid or not you need to be insured. The question is, did the business benefit from your kindness? answer is yes because they usually have their own van to do it.
There's been several similar cases where cars have been used to ferry people about on a free and pay-for-the-petrol basis. One case springs to mind, "the pink ladies" in the Luton area IIRC. Taking kids to school for money, it was regular, it was a business. another was the wife of a minicab driver, used her own car to cover a job on day as hubby was ill, no insurance, no private hire licences, the business benefitted from that job even though no money change hands. I could go on with others I've read about, but everyone ought to be aware of these matters now. Also, if you share your ride, make sure your insurance covers that as well! Mine forbids it as well as parcel and food deliveries.