I am planning to remove an internal wall which is made of concrete
blocks. I've checked its not a supporting wall by lifting the floor
boards, and its been built between and parallel to the joists. However,
from reading previous responses to removing internal walls there is the
occasional mention of non load bearing walls providing support/bracing
to adjoining walls.

This wall equally divides the ground floor back of the house in two and
my main concern is that the wall it is buttressed against (at right
angles) is an internal supporting (brick) wall. This wall rises three
stories and once the non load bearing wall is removed this supporting
wall would be, on the ground floor, 8 metres long and 11 foot high but
without any buttressing.

Its also slightly complicated by the fact that the wall I want to
remove is not an original wall, it was built in the 1980s and the house
dates from 1895. This wall replaced two walls that divided the space
into similar sized rooms. However, following removing wall paper it
appears that at least one of the original walls was either stud or lath
and plaster as there are old screw holes running from floor to ceiling.

Are there any simple checks to discover whether the wall is a bracing
wall or is getting it checked out by a structural engineer/surveyor the
only way to be sure.

Any advice/comments gratefully received.