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Relativistically blurred reflection from the accretion disc provides apowerful probe of the extreme environments close to supermassive black holes;the inner regions of the accretion flow and the corona that produces theintense X-ray continuum. Techniques by which the geometry and extent of thecorona can be measured through the observed X-ray spectrum are reviewed alongwith the evolution in the structure of the corona that is seen to accompanyvariations in the X-ray luminosity both on long and short timescales. Detailedanalyses of the narrow line Seyfert 1 galaxies Markarian 335 and 1H0707-495,over observations with XMM-Newton as well as Suzaku and NuSTAR spanning nearlya decade reveal that increases in the X-ray luminosity coincide with anexpansion of the corona to cover a larger area of the inner accretion disc.Underlying this long timescale variability lie more complex patterns ofbehaviour on short timescales. Flares in the X-ray emission during a low fluxstate of Mrk 335 observed in 2013 and 2014 are found to mark a reconfigurationof the corona while there is evidence that the flares were caused by a verticalcollimation and ejection of coronal material, reminiscent of an abortedjet-launching event. Measurements of the corona and reflecting accretion discare combined to infer the conditions on the inner disc that lead to the flaringevent.

Driving Extreme Variability - Measuring the evolving coronae and evidence for jet launching in AGN