Before you do anything else change the fuel filter.
I've had these symptoms twice before and both times it was due to a clogged fuel filter. 24k and 27k between changes in my case. I service my car every 9k but always forget about the fuel filter - not any more!
Both times I had the same symptoms and afterwards had a fully functioning car again, all for £10-15 and half an hour of my time.
BTW I have VIDA (and its invaluable), but it showed all sorts of fault codes (different each time) when the filter change cured all and whilst the fault codes were logged, the limp home went immediately and the car was back to normal.
Hope that helps.
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