I haven't read all the posts, so my apologies if I just repeat what has been said before.
Total cholesterol isn't that important. You have your LDL (bad) and HDL (good) cholesterol.
According to my GP, LDL divided by HDL should be less than 4.2. Usually according to my vitality tests my cholesterol was too high (5.2 - 5.9), but when I did the lipogram (detailed cholesterol test) it was fine as my HDL was high and my LDL was low.
Also, when I made a comment about cutting out some food or whatever, the GP, discovery nurse, pretty much everyone except the dietician said not to worry about food, just do your cardio.
That said, eating foods high in your good fats which boosts your HDL is a good idea. Eat more fatty fish like salmon, use olive and avocado oil instead of sunflower etc.
Anecdotally, since I started eating less red meat and more chicken (and still average of 2 eggs a day and proper butter with my oats), my total cholesterol is below 5 for the first time in 15 years.