You have base "professional" audio/nav. Won't have an amplifier in the trunk area. I couldn't find a sail panel trim for the front door that did not have the tweeter grille in it so I'm unsure if the base audio system came with a tweeter or not. I'd lean towards not, but again, am unsure. I could not find a tweeter for base audio on parts diagrams, so, leaning towards no tweeter.

Edit: I was looking at diagrams for US spec vehicles. Let me check for across the pond.

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2005 X5 4.4i Build 04/05 Maintenance/Build Log
Nav, Pano, Sport (Purchased 06/14 w/ 109,000 miles) (Sold 8/15 w/121,000 miles)

2006 X5 4.8is Build 11/05 Maintenance/Build Log
Nav, DSP, Pano, Running Boards, OEM Tow Hitch, Cold Weather Pckg (Purchased 08/15 w/ 90,500 miles)

2010 X5 35d Build 02/10
Nav, HiFi, 6 DVD, Sports Pckg, Cold Weather Pckg, HUD, CAS, Running Boards, Leather Dash, PDC, Pano (Purchased 03/17 w/ 136,120 miles)