You might find some assistance here:
http://www.google.com/search?hl=en&s...oq=honda+pilot
and here:
http://www.google.com/search?hl=en&b...q=honda+pilot+
Some suppliers maybe hesitant to export as there are many `goofy' forms and affadavits to be filled out.
pm if there is a pressing need and I will investigate. There are many `parts interchange' manuals here in the US. I would buy the parts and ship them to you after a paypal payment but shipping would start at US$14 and escalate.
You can start your search(es) for aftermarket (replacement, not OEM) here:
http://www.autozone.com and
http://www.discountautoparts.com/
Regular service items like oil filters and brake pads should have UK sourced equivalents to other Honda vehicles. In addition, I really doubt that alternators, starters, etc are unique to the Pilot.