Facelift was 04 with another minor facelift in 06. Dont think they made any interior changes in the 06 facelift apart from a slightly new clock.
The 04 facelift was pretty significant, prefacelift cars looked like they had a dash out a 1998 escort. Cant remember when the ST TDCI was launched but was definitely after 04 so you wont get any prefacelift ones, you will find prefacelift 220s though.
Post 06 gets you slightly nicer rear lights, a new clock and some chrome bits
The 04 facelift was pretty significant, prefacelift cars looked like they had a dash out a 1998 escort. Cant remember when the ST TDCI was launched but was definitely after 04 so you wont get any prefacelift ones, you will find prefacelift 220s though.
Post 06 gets you slightly nicer rear lights, a new clock and some chrome bits