From The Independent:
"Speakers classed in the industry as "double A" grade earn more than £25,000 per booking, and include international sports stars, retired prime ministers and presidents. Bill Clinton is reputed to earn more than £130,000, while Margaret Thatcher has charged £30,000 ~ The former Conservative Party leader William Hague is the most popular speaker on the circuit, again commanding up to £25,000. But Edwina Currie can only expect £4,000".
I'm surprised you single out Blair.