Oily fish 3 times a week is what they recommend to bring down your cholesterol levels. If I were you (again which I'm not) I would go to your GP, everyone over 40 is entitled to an MoT and you might find that an appointment with your practice nurse will be just as effective, and have your BP, height and weight, and cholesterol tested. It does no harm and IMO, it's better to have your results on your medical records, that not - then people will have your latest readings to hand in the event that you do need medical attention. If you are taking unrecorded aspirin then for instance ambulance staff would not know that, if you were in an accident.