Willis Investment UK POSASR Automatic shelf registration (post-effective amendment)

Exhibit 12.1

COMPUTATION OF RATIO OF EARNINGS TO FIXED CHARGES

	September		Year ended
	30,		December 31,
	2009		2008			2007			2006		2005		2004
	(millions except ratios)
Income before income taxes, equity in net income of associates and noncontrolling interest	$	393	$	399		$	554		$	514	$	421	$	591
Add back fixed charges:
Total fixed charges		151		150			106			66		53		48
Dividends from associates		11		9			6			5		5		7
Less:
Capitalized interest		—		(1	)		(2	)		—		—		—
Income as adjusted	$	555	$	557		$	664		$	585	$	479	$	646
Fixed charges
Interest expense	$	128	$	105		$	66		$	38	$	30	$	22
Portions of rents representative of interest factor		28		45			40			28		23		26
Total fixed charges	$	151	$	150		$	106		$	66	$	53	$	48
Ratio of earnings to fixed charges		3.7		3.7			6.3			8.9		9.0		13.5

COMPUTATION OF RATIO OF EARNINGS TO COMBINED FIXED CHARGES AND PREFERRED STOCK
DIVIDENDS

	March		Year ended
	31,		December 31,
	2009		2008			2007			2006		2005		2004
						(millions except ratios)
Income before income taxes, equity in net income of associates and noncontrolling interest	$	393	$	399		$	554		$	514	$	421	$	591
Add back fixed charges:
Total fixed charges		151		150			106			66		53		48
Dividends from associates		11		9			6			5		5		7
Less:
Capitalized interest		—		(1	)		(2	)		—		—		—
Income as adjusted	$	555	$	557		$	664		$	585	$	479	$	646
Fixed charges and preferred stock dividends
Interest expense	$	128	$	105		$	66		$	38	$	30	$	22
Portions of rents representative of interest factor		28		45			40			28		23		26
Total fixed charges	$	151	$	150		$	106		$	66	$	53	$	48
Preferred stock dividends		—		—			—			—		—		—
Total fixed charges and preferred stock dividends	$	151	$	150		$	106		$	66	$	53	$	48
Ratio of earnings to combined fixed charges and preferred stock dividends		3.7		3.7			6.3			8.9		9.0		13.5