Louis Fed president James Bullard has been a proponent of varying the rate of asset purchases to reflect the level of accommodation, while in the past Bernanke has said the total size of their balance sheet, rather than its rate of change, determined the level of monetary easing.

FORBES: Move up http://i.forbesimg.com t Move down

The plans will see the current farmhouse almost double in size along with the conversion of a stable block for staff accommodation, the creation of a pond and the erection of large hack pens where the birds learn to fly.

BBC: Sheikh's Borders falcon centre approved