Has to be 25mph, though obviously there's precious little humour to be extracted from that. Especially as I will be undertaking you on my road bike
Correct, that is the speed at which you judge to be the appropriate speed for that particular corner given the information you have in front of you. Anything more than that is chancing it as you cannot safely pull up within the distance you see to be safe.
The lower high st in my town is a one way road, but you would be a mug to step out into the road without looking both ways as you risk walking into pedestrians, and sorry to say also that there are a few cycle riders (not cyclists) who regularly ride against the flow of traffic.
People only remember the bad ones