but if you have a disclaimer that they have to click to enter the website
Would this be the same as accepting the T&C of any website?
Lets be honest, nobody reads that bull**** or takes any notice of it, you simply click to bypass it.
The CAA is not pro-active in these matters however; it does advise the government on safety issues and rules associated with them. Come the day you have an accident, you will find that your friends are not quite as friendly as you thought when they try and sue you or your estate for their injuries or losses. I have been an expert witness in one such case and they can get quite messy. The rules are there to help you and the primary issue is cost sharing; why else would you want to entice friends to go flying other than to reduce the cost to you? Just remember in doing so you expose yourself to an element of risk and some clever lawyer who makes his money out of your missfortune will use everything in the book to prove its your fault.