From a retailer point of view- You'd need to be registered with environmental health as a food business. Have a 5* food rating Temperature checks HACCP and allergen information Evidence of supplier control- e.g. Where is the fruit coming from?
You will need to speak to trading standards about labelling as well as environmental health. I am assuming you already have at least the basic hygiene certificate? Plus, don't forget your insurances and to register with HMRC as self employed.