"To begin, close your eyes and imagine a vertical line of white light, passing from the nadir to the zenith right through the point of view behind your eyes. Next, imagine a spot of light about two feet in front of this point of view. With this spot trace a horizontal circle around your head. Then trace an ellipse by running this spot up to the top of your head, down your back, under your feet, and up again to the top of your head. Then trace another ellipse from the top of your head down one side, under your feet, and
up the other side to the top of your head."

When you're finished, your point of view should be in the middle of a cage resembling an egg-shaped gyroscope.

"With your fortifications now in place, you may clean out your imagination. To do this turn the line you first visualized into a pillar of fire and cause it to expand outward through your three rings. As it does, cast images of any persistent thoughts or fantasies into the flames and watch them burn until there is nothing left but three glowing white rings.

"Aside from flushing out your mind before and after any magical operation, banishing is your first defense against obsessive thoughts from within and any kind of psychic attack from outside. It also has the side benefit of hardening the aura, forming a psychic shell that will keep your consciousness together and deflect the piercing intrusions of the external world."

Ok a Varient of this is in the book.
This is attributed to Austin Osman Spare banishing ritual. Stephen Mace , I thought described this in his book "Stealing the Fire from Heaven". However, although I believed that was where it came from, when I looked it up in both Spare and Mace, I could not find this banishing ritual and I tried in my current copy of Stealing the Fire From Heaven. If it is in there it hid from me, since in the draft of the book I had it atttributed to Stephen Mace, but then could not find the citation ( if anyone has an older copy of the book, help me out and post the citation so in the next printing of the book, I can change it). On a listserv I am on, they attributed this to Spare as I originally did as well.

So Credit giving where credit is due.