Skylon Update: Tests Continue on Viper Engine

Reaction Engines has this update on its website (via Hobby Space and Rocketeers.co.uk):

During late February and continuing into March, Reaction Engines Ltd returned to testing the Viper Engine at its B9 facility at the Culham Science Centre. 61 test firings have been conducted during this period. These preparations began in order to ensure that the Viper Engine was ready for both the Technical Demonstration Programme and also for cryogenic testing.