Looks like this might drag on for a while: https://coventryobserver.co.uk/news/latest-coventry-police-believe-man-holed-up-in-earlsdon-property-with-his-son-has-weapons-as-stand-off-continues/

The farmer in the next road to me 'lost it' a few months back and pointed a shotgun at someone. There was a stand-off around the farmhouse, but the police ended it pretty quickly. The farmer was sectioned and the police spent the next week going through the farmhouse. I don't know what they were looking for, but they had various 'sniffer' dogs going in. The house has lain empty since and nobody seems to know what's happened to the farmer.

Looks like the police got fed up of negotiating: https://www.bbc.co.uk/news/uk-england-coventry-warwickshire-59991961