"The generous remuneration packages that FTSE 100 directors now receive indicates a marked improvement in boardroom fortunes."

CEOs of FTSE 100 companies also saw similar increases in their earnings. Their total pay rose 43 percent over the last year.

However, Tatton warned companies to expect closer scrutiny of pay in the future.

"Remuneration committees will have to make sure that they are able to provide full and thorough justifications for the bonuses awarded.

"This means that they will have to be much more transparent about how total benefits packages are structure and how performance is measured," he said.