At 3000psi you certainly won’t need a fuel pump to get it from the tank to the engine. LNG is better in large-scale installations. All those small high-pressure tanks seem inefficient and a bit dangerous.
The technology is simple and safe enough in England. They have been converting vehicles to LNG for years. Much easier on engines, too. If the Brits thought it was dangerous, they wouldn’t do it. They aren’t going to put themselves at risk anymore than we would.