This has already been before the court.
Here is some reading:
from which you will see that they can enforce this.
I’m sorry, I know it’s not the answer you wanted.
Can I clarify anything else for you?
I am happy to answer any specific points arising from this.
Please take a moment to look at the top right-hand corner of the page and rate my service by clicking one of the stars at the top of the screen.
You may need to login again to use the rating service. Although it says "rate to finish" it doesn't close the thread and we can still exchange emails.
It's important that you use the rating service because that gives me credit.
It doesn't just give me a pat on the head! It's what gets me paid!!
There is also an experts incentive scheme whereby the more 5 star ratings I get I do actually get a pat on the head!
All you need to do is press Submit.
If you still need any points clarifying, I will still reply because the thread does not close.