In reply to Graeme Hammond:
Sounds like you did Wurlitzer correctly but got onto Wurlitzer again when you did Firefly. The second pitches of these routes are completely independent apart from the finishing clean cut crack.
I think doing Firefly as described in the Lower Wye Valley guide is not how most people will end up doing it. It says "either make a difficult move up left and mantel onto a narrow ledge, or go directly using a thin crack on the right." Both are problematic, the mantel is onto a rounded ledge with soil/grass encroaching towards the lip. Never tried it but looks desperate. The thin crack involves a similar mantel. I've done the route a few times over the years and we always end up traversing further right again to allow an easier move onto the vegetated ledge and then back left to finish up the final common crack.
But you did the crux of Firefly as far as I can tell ( the left slanting crack with two pegs in it) and in some ways your hybrid is more logical and also combines the best bits of both routes. There are comments in the logbooks to the effect that Firefly loses its way after the crux crack. It's an exciting bit of rock at that end of Fly Wall though.