Help! Rover 45

Hi,



My Rover 45 2l diesel developed a vibration going through 70mph. I changed the tyres and it hasn't helped, so now I am thinking an engine mounting.



However, I topped the oil up the other day, and now I got an oil pressure warning light, and I noticed a pool of oil under the car on the right hand side of the engine (drivers side).



Any ideas where this might be coming from?



Could it be head gasket that was causing the vibration?



Or has the vibration caused the oil leak?



What could be leaking?



Thanks

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