Just to allay any fears, don't be surprised if you see the egg(s) lying abandoned in the nest for an hour or more at a time. This is quite normal, and intensive incubation only really gets underway once all the eggs are laid. Then the clock starts ticking, and all the eggs should hatch around the same time.
Thanks to one viewer (Karen Anne in the US) who left a comment and link to a photo of the egg seen early this morning in daylight when their true colour becomes obvious. Having hyperlinks to your uploaded images is the best way that viewers can make webcam snapshots available to us without crashing our email Inboxes. Whenever possible, jpegs are best. Here then is our latest video clip, hot from the DVD recorders that churn away continuously inside Derby Cathedral's ancient tower. It was captured just after first light this morning, hence the rosy glow on the bird and the overall image graininess.
Nick B. of Derbyshire Wildluife Trust added the folliwng comment to this blog entry, but it's really worth repeating here for those visitors who aren't interested in looking at the comments some of us leave:
Just to confirm what Nick M said - the birds need to stop the egg getting too cold (and there is a cold wind in the city today). . . but not start the incubation properly until all four (we hope) eggs are laid.Otherwise there could be up to a 6-8 day gap between the first and the last hatching. That would mean the younger chicks would get a raw deal when it came to feeding time. Now some other birds (eg the barn owl) adopt a different strategy, linked to their much more uncertain food supply. They incubate the first egg immediately so there is a big gap between the first and last hatching. If food is short (and mice and vole numbers do fluctuate widely from year to year) then the younger chicks die - or get eaten by their older siblings (charming stuff!). With peregrines, where food is usually abundant, the strategy is the opposite. Hope that helps to explain their ecology a bit more!