Thanks Keith. Great minds obviously think alike! I actually planned to add glow in Nik ColorFX to the image and, although I usually go the other way round, I produced a version using this after SilverFX (to give more warmth to the tones as well). However, I didn't like the artefacts that the process created around the fine branches and being very selective with control points lost much of the impact. But maybe I'll try it with the glow first then SilverFX and either warm the toning up in that or use a change of colour temperature in LR.