It's the CAA you need to disagree with, along with several recent news articles relating to people/property injured or damaged whilst purely charging(not in use)
The CAA Document below (page 28) details the requirement, after extensive testing that charging alone is not recommended. Section 4.2.5
http://www.caa.co.uk/docs/33/CAPAP2003_04.PDF
Man says iPhone 4 exploded while charging |Society |chinadaily.com.cn
iPhone 4 allegedly blows up while charging | Technically Incorrect - CNET News
M-ONGO
As for not following the above CAA recommendations just because it is a 787 rather than another aircraft is ludicrous.