Martyn will tell you exactly where the filler is, but IIRC it's on the right hand side, looking from the rear of the car, half way up the gearbox side.
Hope you have a good extraction pump to get the old oil out.

Cheers,

Graham (G4FUJ)

Sold L44FOR 4/4 Giallo Fly
'11 MINI Countryman Cooper D All4
'90 LR 90 SW