For
Cheaper prices
Higher specifications from some markets, especially from Japan
Avoid UK waiting lists (many models are launched elsewhere in Europe before they reach the UK)
Availability of unusual or rare cars, especially sports models from Japan
Satisfaction of getting a bargain

Against
Higher loss of value (depreciation) on most imports
Possible problems sourcing spare parts (mainly for rare sports models)
Manufacturers' warranties could be shorter or not honoured in the UK
Fluctuating currency values
Time and effort needed to source the car; worries about agents

Do and Don't

FAQ

Paperwork