Hi Mike,
Not too sure where you're getting that information from but the minority of airspace (outside of airways etc. obviously) is class A - in fact only around very intense areas like Heathrow.
There are plenty of areas of uncontrolled airspace for aeros and GH all over the country even if it does mean a slight transit under a bit of controlled airspace or through it to get there.
Hope that clears things up a little.
CS