This would be an interesting post-mortem
What caused them to fail?
Was it government red tape? Was it a lack of talent? Was it an inability to get various things a rocket needs that are sometimes difficult to acquire? Was it a lack of customers? Was it a poor business model? Was it just running things on too damn much of a shoestring?
A £20m UK government investment doesn't really even get one rocket finished.
I assume "A £6m followed" means they got £6m more funding, which is a drop in the bucket. That wouldn't even equip a small test stand.
It sounds like "we got a pat on the back and a 'good luck' and were left out to dry"