Yes is the answer,

Mitsubishi in the UK now stock most parts since they started selling them. If they are not in stock they hold many items in their Dutch warehouses. and in the case of my need for a new bumper, it only took Mitsubishi 7 days to ship it from Japan, with no shipping cost passed onto me. At this point I must mention that front end parts (bumpers, bonnets, brackets, air radiators) are hard to get. due to the fact most accidents involve the front of the car.

Most people would accept a cheaper secondhand part, which can be picked up from a large amount of UK breaker yards specializing in Japanese cars
The favorite of most UK FTO Owners is Jappex Limited and Japco who mainly deal in FTO's only, but companies like Chalton Autoparts deal in all Mitsubishi's
Most dealers who sell FTO's will also have a supplier of parts who they can recommend

General parts for servicing can be bought form the likes of Camskill Motorsport