It used to be a simple case for the wives to work whilst on the husband's sponsership, just a letter and a labour card organised by the employer. Going onto another sponsership will cancel your "hold" on your wife, i.e. permission for driving etc, as that is now the new sponser's responsibility. All new visa's organised by yourself for your wife now carry the words "not allowed to work" which is a new thing. Not sure what the working wives are doing about it - maybe head in sand......