"Andrew Gabriel" wrote in message
.. .
does anyone know of a good on-line site giving details of how to
construct cavity walls

One brick width gap.

External skin / width of brick / internal skin

Conventionally laid in rows, starting at the bottom...

It's not a bad idea to tie them together occasionally too.
A number of Wilson Connolly new home owners have discovered
what happens when this isn't done...

For real ? How on earth wasn't that picked up at BC inspection ? And
what sort of brickie doesn't use ties ?