Have you seen her? Given that she has appeared in porn and has the look, I’d say her rates are reasonable. There are plenty of sp’s down here now charging £200 an hour.
Saw her years ago and she's offering less services now than she was then at a higher price.
Also, LOTS of girls have done Fake Taxi/Agent and not made it into a paid porn career, so I wouldn't be calling her a porn star, not that you were. Just because she's done a few videos doesn't say to me that she should be charging a higher price. She's like a X Factor contestant who never made it past the first audition.
As far as £200 an hour is concerned, they'd have to be early 20s, stunning and a huge likes list for me to pay that.
