A lot will depend on the individual EHO. They will be interested in other issues you may not have thought of i.e transportation. Im sure Fab Foodie will be along soon he s an expert in this field .
Unfortunately not the area of setting-up and running a food business from home! Catering is a slightly different discipline than Industrial Food manufacture, though the gaps are closing
But some random thinking to add to good advice already recieved.
OK, there's some good stuff here and I'm sure that further searching will reveal more, try local council/EHO sites too:
http://www.food.gov.uk/aboutus/publications/safetyandhygiene/
You should certainly do a basic food hygiene certificate.
Discuss with local EHO
Is there anyone in the catering business who's brains you can pick?
Is there a local catering college where you may get some free advice?
Does your Bank have a small business advisor who may have experience of others doing the same thing?
The major differences between cooking for yourself and supplying food for others is revolves primarily around risk control, complying with relevent legislation and delivering consistency.
Baked products (unless cream containing) are relatively low-risk (microbially) products. The raw materials are considered low risk, though flour for example can become infested or go mouldy if improperly stored. So good storage and control here can be important - seperate storage area, sealed containers, using 'in-date' only materials, First-in-first-out rotation (FIFO) are all small but pertinant details.
Protection, storage and transportation of the final product is also important. Whilst baked goods are low risk, they are not immune from cross-contamination either microbially, chemically or physically.
Other issues will revolve around hygiene practices. A dedicated workspace and utensils. Handwashing procedures, hairnets, gloves, no jewelry, type of detergents and sanitisers etc.
Then there will be aspect of record keeping and potentially awareness of Allergens as well.
I am certain that most of it will be fairly straightforward and common sense. The main difficulty is knowing just how much you have to do for a small-scale operation.
Let us know how you get on!