SocialHousingWorks - nearly, it would need to go something along these lines:
work in a low paid position such that you qualify for a social home (indeed you may need a TARDIS to achieve this as so little social housing is left following the RTB destruction). Join the Trade Union for the work that you do. Work hard and achieve, gain the trust of your colleagues and advance in the Union. Train and specialise in employment law, mediation and mitigation, gain negotiation and representation skills, do all this in your own time over and above a long day, still for low pay. Achieve the backing of your colleagues and become a voluntary representative with the Union. Show your skill and potential in this field and get promoted to paid Union positions. Eventually achieve a significant and well paid position within the Union - or become a 'fat-cat' in other words.
Whilst it is true that a proportion of those reaching such positions no longer come through this route, and even those who may a proportion have lost touch with the common values which began their careers, those to whom you refer SHW do not fall into such a category.