Andy,
Arriving at London from Rangoon on 12th Aug 1929 on the "SHROPSHIRE" was:-

Miss J.W.Gibb, aged 60. She was going to:-
9 Radstock Road, Fairfield, Liverpool.

I wondered if this might be Jane Waddell Gibb (?)
Does the age seem right?

Try dating the voyage as 1890 to about 1915, or whatever you think.

Brian

Do you have access to the Ancestry Incoming Ships Passenger Lists? If you do, try just filling in GIBB, with no first name, and make it that they are coming from RANGOON to UK. Quite a few J Gibbs come up.