Then you'll need a VAP or NMR test to measure the actual size of your LDL particles. If you're getting on in years you might even want to have a coronary artery scan if the VAP/NMR results come back sketchy.
You could have a fine LDL number but if they're all small particles you could be in trouble.
Dr. Davis has blogged extensively about this.
http://heartscanblog.blogspot.com -- search on particle. Depending on how serious you are, you might even join his "Track your Plaque" program. He's had some amazing results at people reversing coronary plaque with diet and supplements.
Here's a good article from the leading lipid researcher in the US about particle sizes:
http://www.meandmydiabetes.com/2010...-ron-krauss-md/
Note: There's NOTHING in the standard cholesterol test that can tell you whether you have problematic LDL or not. Except that high triglycerides sometimes are an indicator, but not always.
Now, I have no idea if these tests are available in the UK but we can get them here in the US, even though we might have to pay out of our own pockets.
Realize that there is no definitive test that can tell you exactly what your risk is right now, but I think the coronary calcium scan is about the best there currently is and the VAP/NMR tell you if you've got an issue that might become significant at some point.