Northern Rock certainly were
en.wikipedia.org/wiki/Nationalisation_of_Northern_Rock

The others we held a majority stake in.
( evil_andy : devilish rogue, Fri 30 Nov 2012, 11:02, Reply)

Did you get as far as this bit?
en.wikipedia.org/wiki/Nationalisation_of_Northern_Rock#Eventual_return_to_the_private_sector

It was sold to Virgin for a song, after we taxpayers plumped it up nicely (Or promised to, by way of borrowing money to give it and increasing our national debt)
(MrOli is ugly, but in the morning you will be sober, Fri 30 Nov 2012, 11:12, Reply)

Was it nationalised?
Yes it was.

As were Kaupthing, Glitnir, and Landsbanki. Of those the first two have had their assets returned to private ownership and the third is undergoing that process.
( evil_andy : devilish rogue, Fri 30 Nov 2012, 11:59, Reply)