Ah thats interesting, I didnt think chromecast could do a screen mirror, I thought it just ran its own apps.
Thanks for the info re the cable out, I read that sky go or whatever its called blocked hdmi out, I didnt know virgin also blocked this. Potentially saved me some cash there. I had thought maybe the cable option would give a better resolution/picture.
I have tested miracast with virgin on my sony tv, works as expected.
I still dont fully understand the chromecast, despite reading the reviews, but may try to borrow one to test.
Soudns like it will be a tossup between a miracast dongle then or a chromecast.
Thanks for the advice.
EDIT I guess I also need to consider distance. I gather the chromecast goes via the router, could be too slow when the tv & phone is upstairs, whereas miracast is direct, so should suffer less lag being in the same room.