What is the general stance of UK monopolies regulation with regard to mergers and takeovers? What is the difference between a management buy-in and a management buy-out? What is the difference between...

What is the general stance of UK monopolies regulation with regard to mergers and takeovers? What is the difference between a management buy-in and a management buy-out? What is the difference between a sell-off and a spin-off? Generally, have mergers in the UK been successful?