Good summary, there is no difference apart from Unions being an official organisation, so thats more transparent than deals behind closed doors. However, unions are yesterdays news thanks to the Employment Contracts Act. The left is more centre than its ever been, the right the same.
Umm, say what now? Under this Labour government, the unions have had more say about how employers manage their staff than they have for a long time. The Unions are alive and well (sadly).