Following on from No. 166, the main differences that a UK specification Insight has compared to a Japanese import are:
1) Rear foglight off-set in back bumper (ugly in my opinion it should have been below bumper in the centre). Importers had to add a foglight.
2) Immobiliser
3) Electric height adjustable headlights
4) MPH / KMH toggle switch on dashboard
5) Single DIN stereo with hinge door cubby hole below (all Japanese Insights that I have seen have double DIN colour Sat Nav stereo system which don't work in the UK).
6) Finally a suspicion of mine is that Japanese Insights seem to have a more polished version of the alloy wheels, whereas UK Insight wheels seem to have a more powdered finish (but don't quote me on that).
I should add that no Insights have been imported since the requirement for imported cars to have a Model Report (initial cost about £3K but can be 'rented out' afterwards) in 2004. See summary of legislation and existing reports at
http://www.modelreports.com