Here's a useful site ...
https://www.craftbrewingbusiness.co...usiness-plan-tips-from-a-brewery-in-planning/
In view of the fact that Environmental Health are asking the questions I would look very closely at your plans for:
- Methods to be used to ensure that the finished product is wholesome and no contamination (including cross-contamination) can take place.
- Storage of everything from grain to finished products.
- Brewing and sanitising methods to be used.
- Disposing of used grains.
- Disposal of trub.
- Disposal of waste water and sanitising liquids.
- etc etc etc
Finally, you will need a Safety Management System to ensure that no-one is injured during production and no-one is poisoned by drinking the finished product.
The "Snail in the Bottle" happened many, many years ago but the principle is part of UK Law so I suggest that you read the following ...
http://news.bbc.co.uk/1/hi/business/8367223.stm
Finally, without the above you will be unable to get any Liability Insurance just in case someone sues you!
Enjoy!