I can’t say I’ve heard of them. Are you in a rural or urban seat? I think labour have votes to spare in urban areas so it’s unlikely to be very successful but if you can get lots of people to vote like that in a rural seat you might be successful.
Personally I think what the UK needs is PR, and we’d probably need a big coalition of left and right to achieve it. Without PR a lot of the time the smaller parties achieve very little.