Mine came locked to Orange, but there's no Orange branding on the phone case, and the box was standard Motorola box with no Orange branding.
From the About Phone menu:
System version: Version.4.1.31.MB860.Orange.en.GB
Model number: MB860
Firmware version: 2.2.2
Baseband version: N_01.86.00R
Motorola webtop version: OSHWT_U1_6.34.0
Kernel version: 184.108.40.206 xphk86@zch68Inxdroid45 #1 SMP PREEMPT Wed Mar 30 15:19:50 CST 2011
Build number: OLYEM_U4_1.3.1
When I "check for updates" there's nothing available.
Update: The stock Orange UK .sbf file can be found here: http://modmymobile.com/forums/4085921-post44.html (thanks to @daywalker04 for this!)
Mirror: http://www.zshare.net/download/90896176a55b65ba/ (thanks to @nitrox1 for the mirror)
Compression MD5 - 268BD6129A59F1398873BF87EDE082C6
SBF MD5 - 9E4C775B15D1B7DC38D0CF94C35C7DF5
Please check your MD5, there is nothing worse than a bricked phone.
Update: The stock Orange UK Webdock APK files have been posted here: http://forum.xda-developers.com/show...&postcount=799 - useful if you try the webtop without a dock hack and it doesn't work
Update: There's now a Modaco forum, which could be a good place to discuss general UK Atrix specific stuff: http://android.modaco.com/category/5...ix-modaco-com/
Update: Great guides to updating to root, unlock and flash GingerBread (2.3.4) on the UK Atrix here and here
Any other info I could provide that's useful? And anything any other Orange UK Atrix owners want to share?