Box Office(Mojo) by Genre

I found the following data (for US box office) at https://secure.boxofficemojo.com/genres/chart/?id=slasher.htm (accessed online 8.4.10 - always worth noting as online material can alter!); it should help you justify the choice of genre in terms of its established box office appeal (though you'll also need some UK box office examples).

Horror - Slasher

1978-Present
Note: Many slasher movies from the '70s and '80s have no box office records, and, hence, do not appear on this chart.
TOTAL GROSSES | OPENING WEEKENDS

Rank	Title (click to view)	Studio	Lifetime Gross / Theaters		Opening / Theaters		Date
1	Scream	Dim.	$103,046,663	1,994	$6,354,586	1,413	12/20/96
2	Scream 2	Dim.	$101,363,301	2,688	$32,926,342	2,663	12/12/97
3	Scream 3	Dim.	$89,143,175	3,467	$34,713,342	3,467	2/4/00
4	Freddy Vs. Jason	NL	$82,622,655	3,014	$36,428,066	3,014	8/15/03
5	The Texas Chainsaw Massacre	NL	$80,571,655	3,018	$28,094,014	3,016	10/17/03