Driving on the motorway and the oil warning light starts shouting at me. I was only a half mile from some services and pulled in. Popped the bonnet, oil level fine, coolant fine etc. started back up and the warning had gone away. Has anyone else seen this happen and found out what caused it?

UK market cars didn't get oil level warning sensors, so presumably what you saw was a red light and sonic warning, which is related to oil pressure, not level.

 

Pressure switch is on the front of the head of the engine, close to the EGR valve, with a green plastic body (from memory), examine for oiliness, particularly within the single-wire  electrical connector, as this has come 'through' the switch as the diaphragm fails, if you find such contamination.  Wire breakage is another possibility.

 

If you haven't got the Driver's Handbook with all the info such as all the warning lights, bells and whistles you can download a PDF copy from here. -  https://manual.skoda-auto.com/004/en-com/Models