Bootcamp Win7 Dual Display (on Thunderbolt to VGA)

Hi,
I've been having a nightmare getting WIndows 7 to work properly with the second display on my MBP 15" (Early 2011) i7.
I'm currently running Lion 10.7.4 which works fine on both the internal laptop panel and the external AOC monitor through a Thunderbolt -> VGA Apple Adapter.
Bootcamp installed Windows 7-x64 with no issues, but when it came to trying to get the second monitor fired up it wouldnt.
I noticed when I installed WIndows and when I boot into it, that the screens mirror one another, I take it this is the Intel GPU running. I'll explain why in a bit.
1) I updated all the bootcamp files through Apple Update, no change
2) WHen I extend the displays, Windows sees the display, make and model without any issues, but it gets no signal
3) I then manually removed the ATI Radeon HD6xxx drivers manually, rebooted and both displays mirrored again throught a 'standard VGA adapter', this is why I assume this is the Intel kicking in.
4) I downloaded the latest ATI Drivers... ATI Mac Drivers -> Bootcamp -> Macbook Pro
5) Rebooted, and still stuck at step one now...
Has anyone else found this issue? Is there any fix for it?
Thanks
Adrian

Just to add a note,
I've resolved this by downloading the BETA ATi drivers from the AMD website.
This resolved the issue.

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HDMI version
1.0
1.1
1.2
1.3
1.4
2.0
Date initially released
December 9, 2002
May 20, 2004
August 8, 2005
June 22, 2006
May 28, 2009
September 12, 2013
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165
165
165
340
340[109]
600
Maximum TMDS throughput per channel (Gbit/s) including 8b/10b overhead
1.65
1.65
1.65
3.40
3.40
6
Maximum total TMDS throughput (Gbit/s) including 8b/10b overhead
4.95
4.95
4.95
10.2
10.2
18
Maximum throughput (Gbit/s) with 8b/10b overhead removed
3.96
3.96
3.96
8.16
8.16
14.4
Maximum audio throughput (Mbit/s)
36.86
36.86
36.86
36.86
36.86
Maximum color depth (bit/px)
24
24
24
48[a]
48
Maximum resolution over single link at 24-bit/px[b]
1920×1200p60
1920×1200p60
1920×1200p60
2560×1600p75
4096×2160p24
4096×2160p60
Maximum resolution over single link at 30-bit/px[c]
N/A
N/A
N/A
2560×1600p60
4096×2160p24
Maximum resolution over single link at 36-bit/px[d]
N/A
N/A
N/A
1920×1200p75
4096×2160p24
Maximum resolution over single link at 48-bit/px[e]
N/A
N/A
N/A
1920×1200p60
1920×1200p60
Maximum 3D resolution (using a full resolution 3D format) over single link at 24-bit/px
N/A
N/A
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