You can view the page at http://www.bushcraftuk.com/forum/content.php?r=635-Superfeet-Premium-Insoles
I used Superfeet for many years. But I urge caution: If they do not "fit" your feet they can cause problems. In my case, they were slightly "too long" for my foot. Because they are rigid in back and have a firm arch, I believe their use contributed to my developing mild arch problems and plantar fasciitis.
What this taught me is that the fit is extremely important. Do not compromise on it!
I have also used Sole Insoles and like that you can mold them to your feet. They are thermoplastic and you heat them in your oven. But the hiking models do take more volume in your boot because of their thickness. Again, it is all about "fit".
So use the brand that fits you best. But if they don't "fit" your foot, TAKE THEM OUT QUICKLY before any damage is done.
- Woodsorrel
Andy-K - you might want to consider getting a Podiatrist to check your feet out as it sounds as if there have been some changes going on. You don't want to be having more severe problems in later life .