Robbie
Is your grandmother's name Kathleen Fellowes aged 31 in 1942 and your mother Shirley Ann aged 1, proposed address in the UK: 17 Caroline St., Bishopsgate Rd., York, Yorkshire?
If so, they departed Singapore on The Duchess of Bedford, arriving Liverpool on 4 April 1942 via Cape Town. Shipping line Canadian Pacific.
Source: Ancestry.com. UK Incoming Passenger Lists, 1878-1960 [database on-line]. Provo, UT, USA: Ancestry.com Operations Inc, 2008.
Original data: Board of Trade: Commercial and Statistical Department and successors: Inwards Passenger Lists. Kew, Surrey, England: The National Archives of the UK (TNA). Series BT26, 1,472 pieces.
Barry