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Yeah I'd say alignment was pretty good, getting no rubbing or anything. Will have a look at how the pads are moving.
When it started howling it had performed well one day and then when I pulled the bike out a couple days later it was howling. At that point it was summer and there would have been no obvious contamination so I feared the worst and thought the piston had cracked but subsequent investigation has pretty much dispelled that.
Checked the caliper alignment without the pads in? Both pistons moving equally and properly balanced? Damp air makes my brakes squeak a bit for the first few taps of them (sintered too) but quietens down with harder braking