Re: Lard or Oil ?
Yep Smoke point of oils is important to note. Using oils with low smoke points will likely result in you creating harmful toxic compounds. Not what we want.
For hot cooking purposes (like frying, oven roasting etc) you need an oil with smoke point over 240 deg C ideally. There are not too many of these.
Avocado oil is a good one but not readily available.
The best option in the UK is likely
Rice Bran Oil. I only use this for cooking. It is often on offer in shops and when it is I simply stock up on it.
Olive oil has a smoke point in the range 160-200 so really not that suitable.
List of Oil Smoke Points here:
https://en.wikipedia.org/wiki/Smoke_point
My choice of oils in total is as follows:
Cooking - Rice Bran Oil
Baking - Coconut Oil (much healthier than other oils and butter)
Salad dressings - Good Hemp Oil
I occasionally use various olive oils for cold applications such as sprinkling on home baked ciabatta and so on.