Yeah BP Ultimate or Shells 99 octane is the best.
The only reason I said about the recirc valve is that when I went to have the revo trial the dealer told me that its not worth it because the standard valve cant deal with the amount of boost your car will be running once the remap has been put on. It say's in your avator that you have a forge 007 recirc valve. If you have got it give it a service and make sure you have the correct spring fitted. You may need to find out what sort of boost your running and then speak with forge about the spring strengh. I can put you in touch with a dealer down here.
thanks for the info but for now and few months i'm pretty skint, so apart from a service no money will be spent on the car until about June(ish)