I don't think the dealer in question is the one that sold the car originally? If it is a UK car, then any UK dealer should be "helpful" enough to do warranty repairs, shouldn't they?
I'm not sure where imports stand with regard to warranty claims.
My understanding is as follows:
Imports would definitely be treated differently, especially if it's a JDM import. The Grey imports (Irish into UK etc) might still be able to get a repair done at a reasonable cost, but I'd not expect a JDM one to be looked after.
uHu, being in Norway, also has the challenge that there is no EU legislation covering the transferability of warranties between purchase and end user markets. Basically the EU have said that the manufacturer backed warranty must be honoured in all EU countries, however, importer/dealer backed warranty's are only valid on products bought and used in that market.
For example if car K was offered with a distributor backed 7yr warranty in the UK, and a 3yr warranty in France, and the car was bought in the UK for the ultimate end use in France then the warranty would be with the UK distributor, and therefore no point in going to the French distributor in yrs 2-7. The manufacturers IIRC have to honour the 1st year warranty as that is the minimum warranty under EU sale of goods legislation that a new car can be sold with.
A lot of this dates back to the mid-late 90's when the Grey import market was at it's height in the UK with cars coming in from low pre-tax price markets, which then gave a greater saving when the UK taxes were applied (Cars are an anomaly in EU legislation, in that tax is paid at Point of Use rather than point of purchase)... and often a lesser warranty that required an additional warranty to be purchased to give the same cover as the UK supplied car.
Perforation and paintwork warranty might be a different case to mechanical warranty, but I'd suspect it's a bit of a mine field as well...