At Kings cross a few weeks ago I saw some wooden boxes and then a week
later ticket barriers.

What is the purpose of the wood? Is it there to act as some sort of
matrix, or are the barriers slotted over it.
The wooden blocks does look a bit flimsy, how is it reinforced?

Does anyone know how these barriers are actually installed. They had a
similar setup on LU about 10 yrs ago when barriers were installed.