I've been searching the forum and youtube but can't really see too many videos using the new spells. In particular I am interested in seeing the new runes and the ash spells.

I haven't found anything either on Youtube. Maybe you could check someone doing a gameplay on Twitch and ask him/her to cast the spell you want to see?

I wont have a chance till Monday ( its Saturday afternoon on Aus atm) to play but if nothings up ill record something after I've done the relevant quest for the merchant to sell them.