In the lid of the boot you will find the BMW toolbox. Sometimes some tools are missing because previous owners lose them, this is what you should find in there. * At the back: warning triangle * At the front, from left to right: 1. Spanner 8mm / 10mm 2. Spanner 12mm / 13mm 3. Spanner 17mm / 19mm 4. Water pump pliers 5. tool to help you re-fit the road wheels 6. Spark plug socket (use the screwdriver as a handle) 7. Screwdriver 8. Allen key for emergency sunroof closing (not shown) 9. Security key for wheel bolts
As BMWs are European, everything is in metric, which is a good thing. :-)
Since the photo was taken I bought a replacement allen key from the dealer, it only cost a few pounds.