999, rightly or wrongly it is widely believed here.
Steamin' Willie and Sapper82 alluded to it.

The Times is running this today.
The full scale of a suspected slavery ring targeting homeless and vulnerable men emerged yesterday as The Times learnt that more than 100 people are believed to have been held prisoner across the country. Police suspect that a network of Irish travellers is behind an organised crime operation to kidnap or recruit homeless Britons and Eastern Europeans over the past two decades and force them into unpaid work, while holding them in squalid conditions on starvation rations. After the rescue of 24 men from putrid and cramped caravans, sheds and horse boxes at the Greenacres travellers' encampment in Leighton Buzzard, Bedfordshire, it has emerged that raids carried out at four other travellers' sites across five counties are believed to be linked through a family with the surname Connors. Four men were charged last night under Section 71 of the Coroners and Justice Act 2009 with the offence of holding someone in slavery…