If you are not sure if you need a food hygiene certificate, please check the GOV website,
Basic requirements information can be fount at :
https://www.food.gov.uk/business-guidance/food-hygiene-for-your-business-0
And More detailed information and advice can be found at :
https://www.food.gov.uk/business-guidance/food-hygiene-ratings-for-businesses
REGISTERING WITH YOUR LOCAL AUTHORITY
It’s free to register, and your registration cannot be refused.
Your authority needs to be notified of any stage of production, processing, sale and distribution of food and drink.
You should register at least 28 days before selling food. If you’re already selling and have not registered, you need to do this as soon as possible.
Ireland:
Use this link to register: HSE Environmental Health Service Online
The FSAI have a website which you may find useful and attached is a sample of the information they provide. https://www.fsai.ie/food_businesses.html
They also have a telephone advice line 1890 33 66 77 should you have any further queries..
UK:
You must register with your local authority (where you pay your council tax). Use this link: https://www.gov.uk/food-business-registration