How do I lower my cholesterol?

I have had a blood test recently to try and find out why I feel so tired all the time and have no engery.  The tests didn’t find anything other than I my cholesterol level is too high.  It is 5 which is not good evidently.  So I have set about trying to find out what I should do to get the level down.  It seems that we make cholesterol in our bodies anyway but it is only when it is high that it becomes a bad thing.

I have read lots of stuff on the internet, some of which is quite confusing, but there is evidence that you can reduce the level by changes in diet and exercise. So out go prawns, eggs, red meat, cakes. biscuits, pastries

 and in come porridge oats, walnuts, olive oil, blueberries, chicken, oily fish, turkey….

     hmm doesn’t seem too bad!      

I will also have to start doing some exercising as I have been quite lax of late.  Do I have to hit the gym or would swimming be OK? Anyone got any other tips, they would be gratefully received