All good information, thanks. I guess spending some down time in the lounge won't be bad thing and thanks for the tip on retrieving and checking in the bags. It's not a "through" ticket as LHR-STO-LHR is separate, the STO-ZRH-SIN-AKL return is an ex-EU Singapore Airlines ticket and the STO-ZRH is on SK and the ZRH-STO is on LX. Wanted to go via ZRH to try the new SQ business class and had to try very hard to get this routing as normally STO-SIN-AKL is via DME, FRA or CPH which I didn't want to do.