Hi Gadget. Ebch and Spidermonkey
I didn't hold out much hope, but I really appreciate you all taking the time to look for me.

Spidermonkey, I do have them returning in May 1922. This would be shortly after William died in China in March 1922. I have no idea how I go about finding a death in China so any ideas on that front would also be greatly appreciated.
From the looks of things Rose and Ada returned to the UK by themselves in 1912 ages about 10 and 8 and I think it's possible that the parents returned to the UK in 1916 and then went back to India/China. I'm presuming William had something to do with the railways. Familylore has it that whilst in India, they lived like Royalty and also socialised with Raj and the rest of Indian high society, so I'm again presuming William had a senior position in the railways, not that it helps much!
We think the photo attached is them which if correct, going by the age of the baby, would have been taken in 1916, hence my theory they travelled back and forth but of course, without a passenger log to prove it, it's all just pie in the sky.
Once again, many thanks and Merry Christmas.
Caz