I know that there's a lot of traffic between London and Dubai, but I'm not sure I see a compelling advantage in flights from LCY to Dubai / Abu Dhabi.
For all the noise it makes, Dubai as a financial centre is not considered yet to be in a the global top tier.
Yes, a route from LCY to the UAE does give easy access to all the people in Canary Wharf, but the time saving involved on a route from London to Tokyo, HK or Singapore would presumably be quite limited, compared to a direct flight from Heathrow
Is the business case really there ?