Sqad....I always thought that you were a secret "leftie" ! ! !
In reality, the Unions couldn't support anybody other than Labour. All political parties have their allegiances...the Tories have big business and Labour has the workers. To expect that the TUC would randomly support any other Party is risable.
Anyway, I don't accept Modellers basic premise. Jobs, Health and Safety, and basic rights are the concern of all Unions, and I can't think of another Party that can serve them better in these areas.
Don't forget, it was Labour that brought in the Minimum Wage, and the Tories voted against it ( with their 165 MPs ) Of course the Tories think its a stonking good idea now, but fail to say why they made no attempt to bring in similar legislation from 1979 to 1997.
In fact, during the early part of that period, the Tories actually made things worse for Britain's workers, by abolishing all the various different Trades organisations that laid down minimum wages, mostly for the very low paid.
TTT ....lol at your suggestion that the LibDems might be a replacement for Labour, in the Unions affections !