I understand from a British friend, a property owner in CH, who has done it (but is not yet dead!!) that you can write your will and require it be probated under UK law. He recommends using a Notaire for this. In this way you can choose to avoid the "enforced heirship" that Swiss law requires.
However I am not sure what happens about estate/inheritance tax. If you go by UK law do you then make your estate subject to UK tax? Here in VS we have no estate tax so it is not something one wants to incur!!