Sadly, unless it is current service, I don't think it is pos to restore one to flying status, as corrosion sets in so quickly when a Viscount is grounded. I wouldn't even walk under the wings of the 7oo at Cosford. I love the Viscount with over 4000 command hours on it, but have seen the insides of them too many times in deep maintanance, ie spar changes and tailplane spar corrosion to give any hope of a future flying example.