Sterling was last at $1.4450, having carved out a massive range of $1.4000 to $1.5022.
Europe's discordant leaders snatched a deal on Monday that might just avert Greece's euro exit, but global investors' faith in the durability of the single currency has been tested yet again.
Sarao was described as a fun guy, outgoing and talkative by other members of the tight knit South Asian community.