Yes..om I meant ground return for the grid leak.
Away for a couple of weeks so the Moreton Cheyney is on hold
It's not easy to see connections to the parts on the rear tagboard so I may have missed something, but I noted there is nothing connected to the junction between R65 and R76 which is odd from the resistor values. Why add 15k in series with 1M? Maybe that junction should be grounded or connect somehow to V9?
Also C32 at 0.5uF looks out of place as it has a low impedance to AF. I can see it decoupling the hot end of R46 but
not decoupling V9 anode.
Maybe V9 anode via C27 and Bw4/2 should connect somewhere in the resistor chain R77 to R67 to reach the grid of V10. There are a couple of rough solder joints in this area so perhaps someone made a mistake?
Another possibility is C41 should go to V9 anode and the connection between C41 and R64 is wrong? I'll double check this area of the circuit as it doesn't make sense to me. As I say there's evidence of rewiring in this area.
Allan