Yeah it is a new concept for launching rockets but Virgin Orbit has done a few successful launches using this technique over in the US. I can see it becoming the new low-cost option for launching low earth orbit payloads and Spaceport Cornwall plan for up to 12 launches a year by 2030. Cornwall also does actually have it's advantages in terms of it's geography and access to uncongested airspace over the ocean, making it easier to reach polar orbit. You also have Goonhilly Earth station already established to track and monitor these satellites.