Actually from my Flex Y ticket I could have upgraded the entire DEL-DXB-LGW for 38odd k miles that was offered at T-48hrs ( if I upgraded both legs together )

At T-24 hours this changed to around 45k miles

these were obviously without chauffeur drive /lounge access and as far as I remember would only give me the flex y miles

PS : Rough estimates as I do not remember the exact number. Regret not transferring my Amex ponts to skywards in advance