They could strike for £10 an hour, or they could show they are a reliable intelligent worker, gain more skills and experience, and then their labour market value will be £10 an hour or even more, at which point they can apply for a better job, either internally or externally. By doing this as a country we will also incentivise people to better them self, and in doing that we will grow the economy and continue to be a rich prosperous society with a high economic output.
Alternatively, why would anyone who earns £10 an hour who has worked their way up into a role that demands more skills and responsibility continue to do that role if they can simply go do any unskilled job for the same money, and possibly have an easier/less stressful time?