BBC – London Underground cleaners to strike over pay: http://www.bbc.co.uk/news/uk-england-london-20843693

London 24 – London Underground cleaners to go on 48-hour strike: http://www.london24.com/news/transport/london_underground_cleaners_to_go...

News RT – London Underground cleaners to strike over pay: http://www.newsrt.co.uk/news/london-underground-cleaners-to-strike-over-...

Shropshire Star – Tube cleaners in New Year strike: http://www.shropshirestar.com/shropshire-business/money/uk-money/2012/12...

Wharf Valley Today – Tube cleaners in New Year strike: http://beta.wharfevalleytoday.co.uk/latest-london-news/Tube-cleaners-in-...