I see Peter Shaw, gives me his opinion which I have generally followed.
I use the C fund, was even advised by my non-EK advisor that it's not bad due to the reduced charges.
You can lead a horse to water etc etc!
I have a QROPS and you should see the charges on that. Annual fees for the wrapper, IFA fees, trustees fees etc. luckily we have had some good returns but you are running into a good 2% headwind for the first 8 years. C account is a lot better deal than many people might initially think.