Oil leak

[hvisser4]

Had the X parked in the garage for 2 weeks while away on holiday and when I pulled her out noticed these oil stains on the floor.
The coin is a UK pound coin (slightly smaller than a US quarter in diameter).
The leak spots are about 50-100cm in from the middle of the front bumper
Was last parked in the garage in April for a week and no signs of any oil leak then.
Had it's first oil service since then (end May). Had not noticed anything before now because I usually park her in the driveway which consists of porous paving blocks.
What could cause this and would it be worth getting it checked out?