You need to know just how bad things are
How long did you drive with the oil light on
Just how tight did the engine get
How bad does it sound now, did your mechanic tell you why it lost oil pressure
If your local to Merseyside Ide take a look at it for you, even help you chuck a second hand engine in if that's what it needs
Might not be as expensive as you think ..........
The engine was totally drained of oil. Took dip stick out and nothing there - just smoking.
Refilled with oil when cool and it starts but if you leave it to run as it warms up a knocking sound starts.
Mechanic advised a pipe taking oil back from air cooler popped off. Must have covered 500 yards with oil light on. Seconds not minutes. Came to a total halt.