I don't just think its enthusiasts, its those that go and take a slight interest from the public. They might remember the name Gresley, when talking about Scotsman or Mallard, but certainly will if the strap line is "pay for a new build engine, design by Gresley, the man who did Scotsman and Mallard." Its a nice and easy spin to make people buy in. Quite sure that's the reason for things like V4 - not as many enthusiasts will have heard of it, or V3, but the spin and PR department can sell that idea much easier by attaching Gresleys name. In any idea, what is needed is the L1, with modifications and not just one.