[robin_reala]

It’s always interesting to browser Mozilla’s public suffix list to see all the weird and wonderful second level domains around the world: http://publicsuffix.org/list/

[josephlord]

It doesn't actually seem to include .co.uk, .ac.uk, .me.uk but just the *.uk and the particular govenmental domains (except .gov.uk).

[khuey]

*.uk means that all foo.uk should be interpreted as public suffixes, except for the ones following that of the form !bar.uk