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Hi I'm Kevin my assumption is that the turbo actuator is sticking rather than the turbo internals .the actuator controls the amount of boost pressur allowed to build on boost.this is very common on the range rovers they used to sell an actuator kit but it doesn't really solve issue the only real solution is a new turbo . The car goes into limp mode when it sees the fault as soon as car is allowed to go to sleep it starts out of limp mode and is back to normal until it sees fault again then you will be back into limp mode.from memory on the sport the body has to be removed to replace turbo
Alls well that ends well glad your sorted unusual one that one seen loads of turbos never a manifold