I don't think you will have much joy with this. It seems to be a very common occurrence now for various embassies. If you want a visa, they are going to make you pay for it!
It is also not just in the UK that this is done. I had reason to contact the US embassy in Canberra recently, and - you guessed it - a premium number! You even have to pay to make a web-based appointment to see them! I guess it sorts those who
really want a visa from the 'tyre kickers'!
Best of luck in your search!