@JdeBP@mastodonapp.uk OK, thx. I think the reason I remember 'purify' fondly is that it would just ping up an editor window and show you where it thought your 'stupid' was. Anyway, my current issue is resolved, for whatever that's worth to anyone else, and it just reminds one that sometimes the best code-reviewer is a sceptical geek with 'no skin in the game'!