MINI and BMW have gone to the a gasket sealant but you will be able to find the oil pan gasket on the aftermarket from Felpro, elring, and Victor Reinz. At my BMW/MINI shop we usually use the aftermarket oil pan gasket.
ECS is listing a elring gasket.
2009 MINI Cooper S L4 1.6L > Engine > Gaskets & Seals > ES#2581086 Oil Pan Gasket - 11137565928
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I know the product development engineers at Victor Reinz. They have a very good product...I use their VR-90 material on my product line at work... I believe they have a different name for it for the automotive market. But it has very good properties for oil pan application. I've used Loctite Master Gasket in a very thin layer on both sides of the gasket. ... but it's very important for the pan and block to be completely clean and oil free..