Have taken the plunge and bought 2 LONE4 tickets. Just retired - so 2016 is one big trip. But I have a few Q's for the experts who live here.

Route is:

0 MAN- LHR - NOT on the RTW tkt

1. LHR - EZE Mid Jan (BA)
2 surface
3. PUQ - MPN
4. MPN - PUQ
5. PUQ - SCL
6. SCL - AKL
7. AKL - BNE
8. BNE - DRW
9. surface - the Gan
10. ADE - BNE
11. BNE - HKG
then home to the UK for summer. Going home HKG-CNX-BKK-LHR-MAN.
Back to HKG in Sep - as yet not booked. (looking for a cheap flight back)
12. HKG - DEL
13 DEL - KUL
14 KUL - NRT
15 NRT - DOH
16. DOH - MAN home for Xmas

Would appreciate comments in general and answers in particular to

1. Date Changes. Who do I contact to switch? BA (they sold me the tkt and am EC member) or the airline concerned eg LAN for the S American legs?? Can I simply turn up at the airport and ask to be put on next flight if L allocation within Y cabin has seats free??

2. I live near Chester hence the MAN start. I have a separate booking MAN - LHR on BA due at LHR at 15:00 to connect with the first leg - BA's EZE departure at c. 22:00. Given the possibility of bad weather in Jan and LHR's capacity issues am I in deep trouble if the MAN flight is seriously delayed or cancelled? Would have no problem being rebooked to EZE if the MAN flight is cancelled and turning up in Argentina day or so late but could I be "no showed" and have entire RTW tkt cancelled??

3. I need 2 one ways to HKG in mid/late Sep. Can be flexible with dates and happy to bag a stop over anywhere from HEL to CMB - I would prefer to do most of the distance on a OW carrier. Any ideas for a cheap but fun routing? No not RUH....

4. Do I get enough points to get any worthwhile benefits on OW eg lounge access in future? Am currently blue. Very blue.

Many thanks in advance - I've learned a lot from this forum but clearly not yet enough.