Stage 1: Z is the nth letter of James' surname (A)
Stage 2: 2nd silver number (B)
Stage 3: 10?6 on Green Plaque above door (C)
Stage 4: 19?8 above gate (D)
Stage 5: 2nd number on white disc (E)
Stage 6: 3rd number of phone no. bottom rh corner (F)
Stage 7: 1st number of street address (G)
Stage 8: White disc (H)
Stage 9: White disc (I)
Stage 10: C is the nth letter of the first word on the sign
(J)
Stage 11: First number on visible road sign (K)
Stage 12: First number on circular sign (L)
Stage 13: Number of gates (M)
Stage 14: Stencilled gpo number (N)
Stage 15: 2nd number after dudley (O)
Stage 16: Cricket number (P)