"Lurch" wrote in message
...

Yes, in order to end up in next doors front room you would have to
drill a good 12"+.

So do you think there are two courses of bricks in between the house and
plaster either side of those?

e.g.

My House - |Plaster| - |Breeze Block| - |Breeze Block| - |Plaster| - Next
Door

CM.