Heading to Europe on Award Economy booking with Mrs Deansie in a few weeks, my question realtes to lounge access (Mrs Deansie has no status & I am Plat) & possibility of upgrades?

QF9 Melbourne to Heathrow - Dpts T4 (Monday 5th Sept)
EI155 London - Dublin - Dpts T1
EI524 Dublin - Paris/Charles De Gaulle - Dpts T1
BA551 Rome/Fiumicino - London Heathrow - Dpts Terminal C
QF32 London/Heathrow - Sydney - Dpts T4 (Thursday 13th October)

If you could help me out with check in desks to use & what lounge access I can use would be great!

Re upgrades was told that I would have to upgrade the whole journey (15K short on points ) & that avaialbility didnt exist? Is this correct? I am only concerned with the Aus - UK segments?
I have reserved seats 46BC Melb - London & 58BC London - Sydney.

Thanks in advance... Deano