They may well be transferring through DXB but I've not heard of many airlines adding capacity specifically detailing that there was a need for F class out of MAN when connecting to their own hubs in addtion to the "traditional" J and Y classes. My gut feeling is that it's going to be a bog standard 20% to 30% of EK passengers being point to point.
Projecting my 7 month total into a full year, we're talking roughly 550000 passengers on the route. So even just 10% travelling point to point still leads to 55,000 passengers that other airines would have the potential to attract away. (In crude terms, more than enough to fill 2 weekly 767s operated by BA in their "regional" configuration).
As for BA, they ceased to be of any relevance some years ago to the majority of the UK as they were unable to grasp any ideas of how to operate out of the regions profitably.