The Chrome plastic lower slat is stuck to the bumper moulding slat with strong adhesive tape and can be pulled off. Likewise the lower chrome surround is stuck on but also has some location tabs into slots on the bumper and can be carefully levered off. Your 2006 MINI will have a smooth flat surround, pre 2004 had a ridge around the edges so part numbers are different.
The parts and adhesive tape can be ordered from your MINI parts dept. See RealOEM.com Online BMW Parts Catalog for part numbers.