The Wickham's Spider in Hot Orange is one of my favourite flies for Stillwaters. Some time ago I tied a snatcher up with the same material combination and to this day has been one of my most successful pulling flies.
It's fished best using an intermediate line on its own or as part of a team of 3 snatchers. Various rates of retrieve work well from very slow figure of eight to long pulls. My favourite is to use the fastest pulling retrieve possible, takes are fierce especially from Blue trout if your fishery stocks them.