The dates and times of the 2020-2021 maintenance periods are as follows:
28 April to 13 May 2020 – work completed early and service operating normally from 4 May
12 March 2020 from 10:00 to 14:00 UTC
11 June 2020 from 10:00 to 14:00 BST
10 September 2020 from 10:00 to 14:00 BST
10 December 2020 from 10:00 to 14:00 UTC
11 March 2021 from 10:00 to 14:00 UTC
10 June 2021 from 10:00 to 14:00 BST
09 September 2021 from 10:00 to 14:00 BST
09 December 2021 from 10:00 to 14:00 UTC