I am working as a SD on the HMRC help and support email service (along with a UR - a team of two). The user logs into the service with their email address, and that email address is then matched with email subscriptions from various HOD data stores. The user is presented with a list of their current email subscriptions, with the checkboxes ticked by default. They are also presented, below that, with a lis of H&S topics which may also be of interest to them (ie topics to which they are not currently subscribed, with the checkboxes unticked). There are a total of 18 topics.

In some cases, eg an Agent/Accountant, the list of subscribed topics may be quite long.

If a user is subscribed to many topics, and therefore has a lot of checkboxes ticked, is there a pattern to allow for 'uncheck all'?
This is the sort of thing we'd like to do...