i think the 'high-synthetic' is just a semi synthetic one (XSS), hence less than £20 from my supplier.
just checked your webpage and it's been renamed from what i remebered, my mistake.

but the CFS is what i plan to use after the next oil change very shortly, just need to decide onthe grade i'll be using, been recommended a 10w60 from a burton chap a while back, but not entirely sure, car gets used, but no track days as of yet (maybe not this year to be honest either).

any advice welcome as i can get that fairly cheap too.
p.s. i'm not a believer in cheap oils, just whacked £35 of oil into a rubbish megane for an oil change today, but i do look around for cheaper suppliers.
good oil returns a cheaper to maintain engine and better fuel economy and so makes money to spend more on the engines lubricant.