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There are LOTS of destinations available to/from London Gatwick (the image below just shows a handful),
Some fares are even slightly cheaper than the £30 mark that has featured heavily in the advertising:
There are some very reasonable Business Class (Club Europe) fares on offer too, though I was sadly unable to find any real availability for the £43 Inverness flights:
With Ryanair generating little but negative press at the moment, I suspect the BA flash sale has probably gone pretty well!