So we're working through that process at the moment. We're not quite at the point where we can do that with complete confidence, because, of course, we don't know what's around the corner. We don't know whether future variants are going to have to throw up a new set of challenges that we may need to respond to. But we certainly know that many of the tools that we have been using previously are now sitting in abeyance and are not ones that we are likely to be using again any time soon.