First you ought to be discussing this with a dr, not a nurse. Nurses are not experts. make an appt with your GP not a nurse.
So I have just been to see another nurse and she basically implies that I must live off pastry and ready meals and that there is no point being tested unless I make drastic changes and basically if I do it in January I can forget about pigs in blankets or gravy etc with my xmas meal.
This is the bit I don't understand.
Have you told this nurse what you eat?
Has she decided that you have not made enough changes yet so there is no point testing you?
There are 2 causes of high cholesterol: genetics and diet. If you are pre disposed to high cholesterol then diet may not have any effect in lowering it, though you need to try diet first.
On the other hand, as the TG article says ( and be aware it was written 2 years ago so is old news) some cardio experts are dismissing the link between animal fats and heart disease.
Arteries get furred up with cholesterol but it's not so simple as fatty food= high cholesterol. Some experts think the link is more to do with sugar intake and insulin levels.
Foods that help remove fat from the bloodstream such as oats, fruit and veg are the way to go, rather than cutting out all fat.
Exercise will perhaps do more for your levels than diet.
Go and see your GP and discuss.