sentences:  Because it was a private venture it received and carried the Blackburn Class B civil test marking B-3 and was referred to as such, though it was also known as the M.1/30A.It performed poorly during testing, still being incapable of meeting the performance requirements of the specification even though they had been relaxed, and being too heavy for the carrier deck lifts.As none of the competitors for the specification could meet its requirements, the specification was cancelled, with no aircraft being ordered.