Hi mate welcome back.
Rocker cover leaks are common on the 1.8t yea they go brittle after afew years and turn into almost plastic then leak.
Nothing to worry about it’s a £40 repair if you do it yourself including sealant. Take a look on
YouTube there are afew guides on there for rocker cover changes.
That way you’ll now what tools you’ll need before you start and where to put the dabs of sealant etc. they can also leak from the tensioner base there is a tiny gasket that can also leak the gearbox side of the engine that is abit more advanced and will cost a tiny bit more for the tool to lock tensioner etc.