Prices In Pounds Sterling

Normally the FAA site recognises the browser settings and displays the prices according to the country. There are 6 different currencies available (AUD, CAD, EUR, GBP, JPY, USD)

However, there is an option on the bottom to change the display manually.

Yes as Robert and Elena says, you can change what you see under "Location Settings" at the bottom of the page

To reiterate

Artists set all prices in USD
Visitors see their own currency