There are two files:

ukd.evpmod	is for FS9/FS2004
UKDirect.vcpmod	is for FSX

Choose the one you need!

To make use of it you need to install EditVoicepack (FS9) or Edit VoicepackX (FSX) which are free programs available from
www.editvoicepack.com
and also at www.flightsim.com and www.avsim.com

Once installed ATC will say "UK Direct" for every plane that has that callsign in it's aircraft.cfg file. Copy the line below or edit the exisiting one in the aircraft.cfg file.

atc_airline=UKD	

Thats it!
Below is an example only, if your still not sure then please ask on the forums,
regards
Mark Greenough UKD171

Thanks to Mike Cremonini UKD189 for creating and sharing these files!!
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[fltsim.4]
title=Bombardier CRJ 700 UKD
sim=Bombardier_CRJ_700
model=
panel=
sound=
texture=ukd
kb_checklists=BombardierCRJ700_check
kb_reference=BombardierCRJ700_ref
atc_airline=UKD				//	<<<----- THIS IS THE LINE YOU NEED TO ADD/EDIT ******
atc_id=G-UAFK
atc_parking_types=GATE,RAMP
ui_manufacturer=UK Direct Airways
ui_type="CRJ700"
ui_variation="UKD"
ui_typerole="Regional Jet"
ui_createdby="Microsoft Corporation"
description="The CRJ (Canadair Regional Jet) family of aircraft was derived from the Canadair Challenger business jet, which began its operational life as the LearStar 600. The Bombardier Canadair CRJ700, which entered service in 2001, is a stretched version of the CRJ100/200 regional jet, with increased seating capacity from 50 to 70. With increased length and upgraded landing gear, the CRJ700 features a longer wing span and leading edge slats. Like other members of the CRJ family, the CRJ700 features an electronic flight instrument system (EFIS) avionics suite and ?glass cockpit? instrumentation."