Prob is that while the aeronautical data belongs to the CAA the base map is copyright Ordnance Survey. You can certainly get the charts in electronic form but they are around 50 quid each with no update option - just buy another when the new one comes out.
See
here for the reason why OS guard their copyright - 20 million is big bucks.
See
here if yopu really want an electronic chart.
Alternatively buy NavBox Pro
here
Mike