Why is nobody interested? If there are big reservations, why do they start with satellite launches? Why not start by making more powerful engines than Rolls Royce, and sell these to all the candidates who are interested.
I have a concept for a better Operating System, i need a big chunk of OS sales. I need Billions to have something comparable to Microsoft. Btw it's a British operating system, the government should give me the money.
The problem is that plenty of people have tried and failed to produce a successful air-breathing rocket engine. Nobody wants to invest any money in Reaction Engines until they can prove that the core concept that the company is built on works. And proving this costs a certain amount of cash. Some of this is being financed by the ESA, in very much the same way that NASA is financing new commercial spaceflight efforts.
In the next year or two we're either going to see them succeed and garner lots of investment, or fail and fade into obscurity.