I did a web search to see what the plugs were, and got asked several questions about year etc. Might make no difference mind you!
I'd start off by seeing what is fitted, then I'd go down Halfords way and look in their book as well. Halfords did have a nasty trick of assigning their own part number, but if you find them on the shelf - not that hard to read the labels on the box!
In general terms, I like NGK plugs as I've never had a duff one, unlike Champion who sold me a set of 4, all faulty. Never used Champions since.
I've tried all sorts of fancy and expensive plugs in the past, but have never really seen any advantage over the standard ones.