GTi MK 5 Oil pressure probs


Audi S3
Section Mod
Just bought a MK 5 GTi absolutely love it!
Drove it home on Monday 180 miles no issues, been driving it all week no probs but on Friday it started playing up. After a spirited drive and it warmed up the oil pressure warning light came on and it said STOP.
Checked the oil and there is oil in there, so I continued on my way. It drives fine, but once up to temperature it comes back. What come it be people? Oil pick up pipe need doing?
Is Bill open today? I might pop and see him.