I posted that pic on 15 Feb 2016
Here's what I said:
Four of the 15 Percival Provosts for the (then) Royal Iraqi Air Force. Nearest airframe is '374' Provost T.53 c/n PAC/F/355. FF Luton 1955. Del to Iraq via Bovingdon 17.5.55.
The Bristol 170 is one of four operated in Iraq and the one in the pic is likely '330' delivered in 1953. All four served until around 1969.
Credit: BAE Systems Heritage Centre Warton-Percival/Hunting Photo Archive