I just noticed you are in the UK--the location of the coolant drain plug stated as being on the "passenger side" might have confused you? Right hand is (normally) in reference to looking toward the front of the car. Cheers.

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TomO
94 E320 Wagon, 170k, totalled in 2006
2002 BMW 525i Wagon, 75k
1991 BMW 318is (two of 'em)