Moel Siabod stands isolated from other mountains, as seen from Glyder Fach. The Arenigs and Arans (thanks Mr G) ranges can be seen on the right horizon.
Image credit: A. Brookes (14.9.2013)
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Would have said the far right horizon was the Arans
I think you must be right, I thought the Arans would have been further to the right (SE) but I haven't seen them up close yet! Looking on a big map, it looks as though the Berwyns would be hidden behind the Arenigs from the Glyders, so it must be the Arans. Ta!