Not sure the base finish is a good guide as Strathearn used fire-polished, and highly (flat) polished bases in equal quantities. I think all the aurora's i've seen (only got a blue at the mo) have had fire polished pontils. However, urchin (blue and orange), ice pool, stoer, tropic, orchid etc etc all have highly polished bases.
It's certainly not a typical aurora set up - you expect evenly placed rows of bubbles and this isn't the case. Looks to be two sets of three spaces bubbles only. Will just have to label "unknown, possibly scottish" (again)
Whilst on the subject of Strathearn - one of my Ice pools bears a triangular Design Centre London label rather than the normal Strathearn label.