My iPad has 64 gb storage.
I have used so far 18 gb.
When I go to 'managing usage' in Settings, it tells me that of the above 18 gb, 6.1 gb is taken up with Mail.
But I keep all my Mail boxes to an absolute minimum.
So why the 6.1 gb?
How can I reduce this 6.1 gb.
Many thanks, I love my iPad to bits (no pun intended)

Try this. It helps with some storage issues:
Battery Doctor - Must-have Battery Management App by KS Mobile, Inc.
https://appsto.re/gb/gRZTK.i