[fonfe]

Do you mean into your current lv focus? Just that's not a mk1 mate, mk1 focus is the original very first shape ;) technically a 2010 model is a mk3.

But to answer your question, yes it should fit in the hole. You would need the surround to go with it and I think the multiplugs fit but I'm not 100% on it as I've never checked them before. I do have a spare head unit like the one your looking at that I took out of our race RS we are building but don't have a non RS focus to check the plugs against :(
Don't think the Bluetooth would work unless you had the Bluetooth module already fitted from factory in your focus but again I'm not 100% on that.
Do make sure you get the radio code off the seller though when you buy it as without it the thing will be pretty useless!
If you can't get it just send me a pm with the radio's serial number and I'll get you the code but it will cost you as it costs us to get them each time as every one is unique to the radio.