On the subject of failure (hate to dwell on it, but how else am I going to learn) my early start on the brassicas this year turned out to be a waste of effort. The red cabbage on the right was sown on 21st March in modules on a windowsill. The red cabbage on the left was sown outdoors (and covered with fleece). Despite its later start the outdoor grown seedlings are so much better!
The cells are too small (although no roots were showing through the drainage holes)
The temperature was too hot
there wasn't enough light
The potting compost was too rich for them.
I overwatered them
They got a shock when they got put outdoors
I should have potted them up or planted them out sooner
All in all its too much of a waste of time. I'm going to avoid this experience next year.
This was the starting point (in reverse order):
All (brassicas) for nought.
For the record
Time spent last weekend 4.5 hrs
This weekend 4.5 hrs
On the plus side - No money spent!