So the Shell drivers are striking because they have had enough of relatively low pay - squeezed by their employer ever since they were transferred in an outsourcing deal.

Clearly someone at Shell decided that driving tankers was not their 'core' business, and/or that they could do this more cheaply if they could transfer it to another company who 'specialises' in this sort of thing.

Research shows that, particularly in service jobs such as driving, cleaning, catering, outsourcing...