Yes, Fox was saying there's a total of 19 arrested and they were also saying they can be held up to 14 days without being charged....very cool! (Perhaps your friend can clarify, but is the 14 days allowed for just those who are arrested on terrorist-related investigations?)
Fox, again had a video segment, that so far , 35 people have at some time been detained, some of those have been released however.
Only in terrorist investigations is it 14 days. Part of Blair's package of terrorism legislation extends it to 30.