new MINI : low oil pressure warning after oil service? heres the reason

Got a new shape MINI ??? recently had an oil filter change (service) , and now the oil pressure light comes on at idle???

the filter has probably been incorrectly fitted !!!!
Get it fixed ASAP.
Some info after a friend at work had a similar issue.

http://www.minicarparts.net/TechTips/MC_LowOilPressure.cfm
http://www.mini2.com/forum/first-generation-faults-fixes/161688-oil-light.html
http://tech.bentleypublishers.com/thread.jspa?threadID=29791&tstart=105
http://www.promini.com/technical/tech_tips/cooper_oil_filter.php