Hi Robert and Malcolm,the bright supernova website
Here gives a mag of 14.1

it seemed fainter to me,but I haven't seen it since Monday and it is surposed to get brighter.
Malcolm,I think you will nead a really good sky to see this Supernova in your 12" as the galaxy is not very big and the Sn is faint, but fingers crossed that it gets a bit brighter.
Cheers