Possibly the seal at the bottom of the tank. I have been told that moving the tank out of the way for the filter change can cause that.
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Crashton Club Coordinator
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My R56 CoopS has leaked water from multiple places over the years -- often at the left front. The expansion tank would be the easiest leak to find, and fix. Let's hope it's that.
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nkfry New MemberMotoring Alliance Sponsor
MINI Expansion Tank Hose
You may want to take a look at your thermostat and oil filter housing area for safety sake, either of those can leak in the same area. Chances are that your leak was caused by moving the expansion tank though. -
Crashton Club Coordinator
Nice to know that part has been improved.