One other thing... I don't know how the Brits do it, but I cringe whenever a server allows the beer to touch the spout. There is no reason for this to happen; all it does is soils the tap. The draft beer guide put out by some group here in the US explicitly states that you shouldn't allow this to happen...
Are you talking about the cask beer poured through a beer engine? I thought the spout always went below the beer in the glass on those. Could be wrong, I've never used one.