Finally, the rattling is at an end. Chimney cowls are an important item of domestic engineering here. They keep birdies out of your home heating systems (or are supposed to), stop downdraughts from pushing fire smoke into your living room, and stop rain from getting into the system.
Unfortunately, in a place that is relatively windy, no ordinary cowl will do. The previous owners of this house went through a few, and, after increasing rattling caused by the wearing of bolts, it was time we did too. So our neighbour Andy was up on the roof just now, removing what was left of the old one:
... and here's a movie clip of him attaching the new one:
Nice shiny (it won't last) cowl. Though the bolts, supplied with the cowl, that stick out may become somewhat unwanted bird perches. We'll see.
The process of purchasing the cowl turned into another exercise in online shopping microeconomics; more on this soon.