Missing County

Hi, we need to work with a 3rd party and they require Middlesex to be an optional UK county. I see that you have a legacy option that has Middlesex which we could use to resolve this issue but the problem is that it does not include at least Bristol so there are still at least 1 county missing. Please can you ensure the legacy option has all counties available including Middlesex and Bristol etc so we can use it? If there is a problem with this approach could you include an alternative option such as creating another list for selection or providing us with a hook that we can add to our theme to add Middlesex to the current UK list?