Gemma, when they say don't eat deli meats it is only because you are never sure what temp they are kept at and how long they have been sitting at the deli for.

If you buy a fresh pre packed ham (you know how they come in the vacuum sorta plastic), it normally has a used by date of a couple of weeks before opened, and once you have opened it, just make sure you eat it within a few days of being covered in the fridge.

Turkey and chicken are both fine. If you are having it cold, you just need to make sure that you cook, cover with a clean tea towel and bring to room temperature, then cover and refrigerate. This is safest way of doing it. If it is hot, then you can gorge yourself no worries.

hope this helps