Members of the public are not subject to the food standards regulations or the UK Food Information Amendment, also known as Natasha's law (even if products were to be wrapped in cling film etc). Where a school or organisation is "hosting" the Coffee Morning and inviting the public to donate goods, again they would not be subject to this regulation. If a school or organisation is a registered food business and supplies their own products they would be subject to the regulation (as for any products they produce). It is considered best practice to list allergens where possible, but as above not a legal requirement for the public. For more information please visit the Food Standards Agency (FSA) website.