It will create about 40 roles from boiler engineers to back office support staff.

BBC: Energy firm supports 300 new jobs

Boiler shops are now going back to "pluck the chickens a second time, " according to Alaska state investigator Edward Watkins.

FORBES: Magazine Article

The helium, which by then will have risen to about minus 15C, is pushed through a liquid nitrogen "boiler" to bring it back down to its run temperature, before looping back into the pre-cooler.

BBC: Key tests for Skylon spaceplane project