one of london's most popular parks, brockwell park in south london, is closed today after yesterday's visitors. the bbc‘s john mcmanus is at a park nearby which remains open, and he sent this update. forecasters say that temperatures could reach up to 21 celsius in some parts of the uk today, a lovely sunny, warm day, and of course that's a possible temptation to some people to perhaps ignore what the government says is an instruction, not advice, but an instruction to stay indoors unless they have a few specific reasons to be outside. that is to get food, perhaps if they're are a key worker on their way to work, or of course to get unlimited form of short exercise. and the health secretary, matt hancock, has been reiterating that message this morning, saying that a small minority of people are putting both themselves and others at risk by flouting that guidance. that's very pertinent for this part of london, peckham rye, which is a large open space in south—east london, because here yesterday police were travelling round in a car using a loudspeaker and telling sunbathers to stop doi