The tender calf has been responding well to the roller in that the spasmed zone has relaxed; or maybe time would have healed it whatever. The important thing is that it's recovering.
Today's swim was no great advance. Three consecutive lengths with bilateral breathing are still a struggle but can be done with careful pacing. When my stroke is at its best I can feel how I'm pulling against the water at the deepest reach but maintaining form is a challenge. In general though it seems I am able to keep form more than I was a few weeks ago.
This is an interesting blog entry about how inefficient human swimmers are. So now I know why I can run so much further than I can swim. It looks as though I'm around the 3% mark.