In uk.railway Adam H. Kerman twisted the electrons to say:
How many British bank customers lost money in Iceland?

AFAIK, the only money that UK retail customers "lost" in the Icelandic
shenanigans was the interest they would've earnt between the banks
failing (or being failed) and when they regained access to their money.
The Chancellor of the time being very free with the taxpayers money and
promising to compensate everyone in full, even if their account balance
was above the #50k FSCS limit. (Said limit having only increased from
#35k to #50k on the day that IceSave was closed.)

OTOH, several UK local governments did lose money. They where required
by central government rules to put any surplus cash in the (UK available)
account with the best interest rate, but where regarded as entities
competent to take their own risks and hence where not covered by the FSCS.
--
These opinions might not even be mine ...
Let alone connected with my employer ...