Psst - Landroger: Belvedere = same engine(s) as Wessie 1 & 3, ie Napier Gazelle. Turboshaft, which I'm pretty sure uses a turbine, no?
Anyway, any fule kno that an AB205 beats any Wessex in the mountains any day. And my little Bolkow these days ain't too bad - pity it can't lift much more than half a verbal message when compared to my luvverly Chinook.