I work in PR (agency) and if I was working permanently, I would be on what I was told to expect but I fell into freelancing by accident and it pays a lot more. And the more experience you get, the more you can increase your day rate
However, there is the stress of finding the next contract which I found recently and was out of work for 3 weeks and still catching up financially but now have a good length contract.
I'm also on PAYE so still get 24 days holiday as well