Semperian PPP Investment Partners Group
"Semperian PPP Investment Partners Group Ltd (formerly Trillium PPP Investment Partners LP) was launched in 2007. This investment vehicle was designed to give investors access to a large, diverse, portfolio of mature PPP investments that had been accumulated over a number of years. From launch, the portfolio benefited from a management team that had worked with the underlying assets since their original acquisition in the secondary market, bringing unrivalled expertise for the benefit of public sector clients and investment partners. Semperian now manages 106 PPP assets with a value in excess of £1.35 billion. " 
In July 2012 "REPRESENTATIVES of the tube union RMT on the London Transport pension fund have called for disinvestment from Semperian PPP after it emerged that one of their subcontractors on the Great Western Hospital PFI contract in Swindon, Carillion, has been involved in a long-running dispute with sister union GMB over racial abuse, bullying and extortion."