I have a question for the experts. I'm pretty sure it's as I suspect but can't hurt to double check.

I am flying MEL-SIN-DXB-ARN all booked with qantas points on one ticket.
MEL-SIN is currently booked in Y with this rest of the legs in F
Question is, will I get any sort of lounge access in MEL based on the majority of the trip being in F? (Luggage allowance is the same all through) Or will I need to dig into the 1 off lounge passes that I have?
I am only currently QF Silver so no status based entry.

I only ask as I remembered on a previous routing that I had booked I would have been in Y from HEL to LHR but would have (I am told) had lounge access as my onward flight from LHR was in F

Thanks for any info!