I am hoping to book the following trip and have found the dates and flight times that work well.

GLA (or LHR) - DXB - SYD
MEL - DXB - LHR

Outbound is going to be business. Inbound is a little more complicated. I would like the MEL - DXB leg to be in economy and the DXB - LHR leg to be in business.

I can see on the Emirates site that I can do outbound and return in different classes but I can't seem to be able to split the classes for each leg of the return. Ideally I'd like to be in business all the way but I'd be the only person in the group sitting up the front (maybe a blessing!).

Is this something I need to phone Emirates for, or is there an option in the Advanced flight search that I've missed?

Thank you for your help.