New pre-print by @mishkendall @ChristoPhraser et al estimates that launch of test & trace programme in Isle of Wight was associated with decline in infection numbers and R, and reduction larger than in most other comparable areas of UK during same period. coronavirus-fraser-group.org/blog 
Note limitation: "To prove that the TT programme was the cause of the success in the Isle of Wight would require us to rule out all other possible causes, and we have not done that in this early analysis - we would need more data."
"What we can say is that the Isle of Wight controlled their epidemic particularly well and that this warrants further investigation in case the causes might translate to other local and national control strategies."
