I discovered a couple of voyages that an Edwin John Ewbank Guest made.
Departing 15th Jan 1948, Southampton to Bombay on the STRATHMORE,
Edwin was aged 44 (born est 1904). He was a Loco Driver, and he came from Belle View, Warren Rd, Bexley Heath.
Departing 12th Jan 1950, London to Bombay on the HIMALAYA, Edwin is now 47. This time, he was coming from 27 Oaklands Rd, Bexley Heath.
Again he is a Loco Driver.
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I can give you a tiny bit of info about a GUEST marriage in India, but I have no idea if this would be connected with your ancestors.
1885. Louisa Guest at CHAKRATA, INDIA married either John Hutton or George F Wilkinson. Page 157, GRO Army Marriages 1881 - 1955.