The construction industry was regarded as the most corrupt and organised-crime ridden sector in Britain, at least in the 1990s, when I spent time auditing. For example, on average 20% of goods ordered never arrived on site - being 'pilfered' along the way.
The scaffolding industry was particularly prone to OC activities; in another example in 1995 a contractor working at RAF Lyneham had a number of his vehicles fire-bombed in Bristol and thus withdrew from the contract, requiring 'single-tender action' to permit work to continue - and to allow a much larger - and more shadier - firm to take over. That sort of behaviour was particularly prevalent.