Sadly the main driver behind this is the UK Government
Certainly are. And they're guilty themselves. They introduce mandatory employee pension schemes, demand high payroll taxes, high standards of welfare and H&S (all good things in a way) but then the fuckers use offshoring to exempt their own badly run departments from these taxes and obligations. My wife works for the NHS - payroll and staff admin are outsourced to Steria in god-knows-where, and IT support is from South Africa. The same applies to DWP, MoJ and the rest.
Multinationals do the same as the government, so the story is that taxes and worker rights apply only to UK based SMEs. And successive British governments have been made up of feckless lightweights unable to see the vast damage that offshoring does to the UK - loss of jobs, loss of skills, loss of UK tax income, and worsening our already dreadful trade imbalance.
So here's the real message from the goons at Westminster to the British people: "Sod the economy, sod your children's employment prospects, we're only here to save you from climate change and paedo-terrorists."