Sorry to have been incomplete/imprecise:
Chemistry at 20C
2 minute presoak with gentle agitation.
Developer (6ml Rodinal + 600ml water - I know folk use as little as 3.5ml per roll - as indeed I have, and it was successful - but I prefer to err on the side of caution now)
30s initial gentle agitation.
I didn't try to monitor temperature, but did stand the tank in a large volume of 20C water to try and maintain temperature.
I have experienced streaking with stand development (especially in 120) which I presume is bromide drag, hence the addition of a little agitation during the standing period in order to try and avoid that.