I have found my bike in the cellar, serviced it, raised the saddle, got me a basket for the back and yesterday I did a test ride - it takes 7 minutes to ride to work, hurrah! Plus it's an easy route, so other than changing shoes, I can wear my normal work clothes.
Which raises the question: Why did I never ride my bike to work before? :-)

The plan is to ride to work, then at going home time, peddle like mad home, dump bike, change into running clothes, run 20 minutes to pick up boys, walk or get tram home.

Hoping that I can fit this regular exercise into my week!