Although the 98 Wildcat Trail is featured in BikePedia, I can't find any evidence that it was listed for sale in the UK, so your example may be a special import of some kind. The Bikepedia entry says it cost $2,099 in the US, so it would have been around £1,700 in the UK if it had been listed. The price you have paid seems quite cheap to me, although it obviously depends on the condition of the parts.
I think the Hope C2s are contemporary with the rest of the bike, so they don't in themselves stop it being 'retro'. Whether you call it retro is up to you. Retrobike management hasn't adopted a definition of retro, I think out of a general spirit of liberal-mindedness. But it has split the readers' MTBs section at December 1997, perhaps as some kind of subtle hint of where a date definition might fall if there was one (but there isn't).
http://www.bikepedia.com/QuickBike/Bike ... &Type=bike