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Percentage of days in April and May 2015–2020 when D90 and D99 could be reached within a day and when D90 could be reached within 1 h. D99 could not be reached within 1 h for any day or any UK location. For March, D90 could not be reached within a day on most days (see Table 4) and the number of days when D90 could be reached in 1 h and D99 could be reached in 1 day was negligible (mean and range 0.1% (0.0–2.2%) and 0.1% (0.0–1.4%), respectively).
