Possibly start of dirty war with BE on domestic routes
I don't really think so. If they were launching multi-daily from LGW then I would agree.
This just gives another (welcome) option for flights to/from Cornwall during the busy Summer season and of course the connectivity options
Having said that I've not seen the timings for the new LHR flights - they don't appear to be loaded on ba.com (or skyscanner) yet?