Hey Jo, Carla and Whitedove (and anybody else I missed) - just wanted to throw a quick bit of information in on CoQ10 here and tell you where you can get good quality CoQ10 on the cheap.
CoQ10 is a vitamin like enzyme that is generated naturally in the body from several B vitamins, vitamin C and a few others and it acts as a co-factor in many processes in the body including building many different enzymes. CoQ10 is believed to be at least partly responsible as a co-factor for up to 95% of the body's energy requirements. It is used in Japan by prescription to prevent and treat strokes, treat congestive heart failure and several other ailments. It is probably one of the most important nutrients our body's need and it can't be obtained directly from food (the vitamins mentioned earlier are in foods, but it is often hard to get them all from food alone, and if there is a deficiency in any of these vitamins the body simply can't produce CoQ10 effectively - and the body produces less CoQ10 as we age as well). It is considered to be very important for heart health and also helps regulate blood pressure.
The best prices I have found anywhere are from Puritan's Pride and until 5/31/08 you can get 70% off and shipping is only 26 cents anywhere in the US for any size order. They also have good prices on all their products including high quality multivitamins and many other things - shipping would still only cost 26 cents no matter how many different things you order (and I am not connected with them in any way except that I order vitamins from them). Here's a link for CoQ10 - scroll down the page to see the different potencies and quantities available.
For instance 200 capsules of 30 mg are $6.97 (which is about 3.5 British pounds for my friends across the pond).
And for at least the next several months,
Puritan's Pride has flat rate shipping to several countries including the UK (check the "international shipping" part in the upper left hand corner if interested). For the UK, the rate is $3.95 handling plus $14.99 shipping (which is about 9 British pounds total).
I checked out Holland and Barrett in the UK (apparently the largest vitamin company in the UK) for pricing on CoQ10 and the same quantity and potency (30 mg, 200 capsules) is 35 pounds per bottle which is ten times the cost for the CoQ10 from Puritan's Pride. Thus, even if you're in the UK you could buy 8 bottles from Puritans Pride with shipping included for about the same price as 1 bottle from H&B (without shipping).
To the best of my knowledge, the quality of products is at least as good from Puritan's pride as anywhere else. For instance, they use rice bran oil as a "filler" in their CoQ10 which is supposed to be the healthiest type "carrier oil" available (rice bran oil contains small quantities of several vitamins itself and it is not hydrogenated oil which means it should be healthier than other types used). Many more expensive CoQ10 products from other places use hydrogenated canola or soybean oil as a "filler" or "carrier" oil which is not considered very healthy in and of itself - these are basically the trans-fat oils that are considered very unhealthy(some products use vitamin E oil but it is also often made with hydrogenated vegetable oils). I personally think the Puritan's Pride CoQ10 is very good quality when compared to similar offerings from other places, and independent lab tests that can be found on the web have verified that their CoQ10 is exactly what the label says it is.
There are more expensive (quite a bit more expensive) CoQ10 products available called ubiquinol - this is the actual form the body uses. However, the standard CoQ10 formulation discussed above is simply a very common enzyme reaction or two away from being ubiquinol (the body naturally performs these enzyme reactions so the CoQ10 becomes ubiquinol in the body in very short order). Thus, I personally think the standard product works quite well without paying extra to get the actual ubiquinol in the capsule.
Just thought I would post this so everyone that is interested could take advantage of the deal at the link posted above if they wanted (and order other vitamins if interested) - especially the folks in the UK (I don't know where you get your CoQ10 Jo, but this might be a better deal for you too, even with shipping

).