Flood & fire - Emily Diamand

Flooded England, 2216 -
Lilly Melkun has outwitted the bloodthirsty Reavers, who prowl the
waters that cover most of England - and escaped to Cambridge.
But Lilly is far from safe, because still in her keeping is PSAI,
the last hand-held computer in existence - a now malfunctioning
treasure from the past. Inside the jewel-like computer, is a sinister
looking chip with an unknown purpose. Worse follows, when the
professors of Cambridge plug it into an ancient mainframe computer
setting in motion a fiery chain of events leading back to London.
A false, anti-terrorist alert has been activated. Strange, out-of-control
robots from a long-ago technological time, threaten to use
'maximum force' to control everything in their way.
Once again,
it's up to Lilly, Zeph and friends to save the world from burning.