I was looking for someone to answer this problem and couldn't find anyone!
So I became the guy who's done it
1. Don't buy from Simply Electronics, they gave me the round-a-round and owe me my money!
Mobile Phones MP3iPodMobiles - Motorola Atrix MB860 (Black) Android 2.2 with Logo SIM Free / Unlocked
2. I purchased from these guys!
eBay My World - techno.trading.house
They still have 2 at the moment:-
Brand New Unlocked Motorola Atrix 4g - eBay (item 270710913913 end time Apr-24-11 10:51:01 PDT)
You get to track the phones by Fedex and it all just happens!
I ordered on the Wednesday and had the phones on the Monday (yes, I ordered 2)...
3. How to root (you don't need to, but do decrapify the AT&T sh1t that comes on the phone)!
SuperOneClick v1.7
[APP]SuperOneClick v1.7 (Root, Unroot, Enable Non-Market App) - xda-developers
Your anti virus may go nuts for "rageagainstthecage" but everyone assures me this is normal as the s/w cheats to get past ADB!
I've done it on both phones and I'm very happy! I'm using T-Mobile UK, everything works a treat!
BTW - If you don't want your phone feeling so "American", download from "market" the
MoreLocale2 app (telephone number display, it may not look as though it worked, it has, it's just the history of the current numbers)...
Top right, hit "Custom Locale" on top right
then enter settings (ignore quotes)...
Language - "en"
Country - "GB"
Variant - ""
Good luck!