I have had a look at this and would like to point out that UK Spec cars are very different to US Spec or even JDM Cars. The price given is then subject to import duty and VAT not to mention the shipping costs.and I wonder weather UK Spec car wiring looms would fit it.
You will also need someone who is fluent in written Japanese to complete the pages following the bid page. Google Chrome translation is absolutely no good for this as it wouldn't cope.
Fair shout for finding this but personally I would walk away. I can get by with my Japanese but I wouldn't even go for this. Hope this helps