On 05/05/2018 23:11, Andy Burns wrote:
ss wrote:

My understanding is that the outer brick should be set in some sort of
strip foundation and this stops `it` and the rest of the block from
walking.

http://pavingexpert.com has chapter and verse, but the outer blocks
need at least half their depth bedded into 4" of concrete

There are plastic L shaped devices that can be 'nailed' into the
ground to provide edge restraint for block paving.

A slabbed patio on a proper base generall;y doesn't have the same
issues.