Sibton Auxiliary Unit Patrol
This page was last updated 20/11/13
Thank you for selecting information on the Sibton Auxiliary Unit Patrol and
their Operational Base in Suffolk. The info and images below have been
supplied by Aux researchers Evelyn Simak and Adrian Pye.
The patrol formed part of the Framlingham Group
Group CO: Capt Scott Moncrieff
2nd Lt LWO Turner
Lt TH Denny
It is currently unknown when the patrol was formed.
Cpl Eric Newson
GL Nimmo (Sgt)
The OB was built into the steep bank of a small stream skirting the edge of mature woodland (Kendall’s Wood)
near South Green / Grove Farms.
The main chamber and entrance shaft are intact but the emergency exit tunnel has collapsed and was later
The main chamber measures: (L) 3.65 x (W) 2.45 x 2.40m (at highest point) and is orientated NNE/SSW
The drop down entrance shaft measures 0.75 x 1,00 x 3.00m deep (approx). Length of emergency exit tunnel is
Other physical remains are corrugated iron sheets originally used for lining the walls of the emergency exit
tunnel. These were removed during excavation and dumped beside the entrance opening. 3 concrete counterweights,
pitched, with pivots made from gas piping: 0.45 x 0.40 x 0.15m (approx). There is also a field drainage pipe across
one corner of entrance shaft presumably carried phone cable or coax aerial cable.
The OB consists of a 12ft Nissen hut resting on a base of red brick, with both end walls as well as the drop
down entrance shaft built from red brick. The entrance shaft cover is missing. Steel rungs (badly corroded), set
across one corner, provided access.
The entrance shaft and main chamber are intact and in good condition, the curved corrugated iron roof of the
main chamber is corroding from the base upwards.
A (broken) field pipe is set across one corner of the shaft approximately one metre below ground level. The pipe
is set into the wall above the entrance doorway. It runs in the direction of a nearby tree and in all likelihood
carried either a phone or a coaxial aerial cable. There is an approx. 15cm long nail almost completely embedded in
the tree directly in line with the field pipe at about 1.80m above ground level.
The main chamber houses the original three concrete counterweights (See below)*. Two recesses - one on each side
of the entrance from the drop-down shaft into the main chamber – accommodate vent pipes which emerge above ground
level on either side of the shaft entrance opening.
The doorways of both entrance and exit are facing each other. Stephen Lewins/CART points out that “The doorways
have an unusual curve to the top, normally they didn’t go to so much trouble.” Unusual also the two recesses
accommodating the vent pipes.
The emergency exit tunnel (see below) measures about 6 metres in length, leading away from the main chamber in a
straight line and emerging about one metre above the bed of a small stream which at the time of our visit (early
July) carried no water. The tunnel had collapsed and was dug out and made safe (walls stabilised at some time
during the past 10 years.)
* We photographed a very similar counterweight at the BROM/Parham that had been found at Stratford St Andrew
Observation Post/s: Currently unknown.
BROM / Parham volunteers visited the OB in March 1998 and found the entrance shaft in good
condition, complete with steps. Main chamber complete brick ends. Vents, escape tunnel blocked.
The site was excavated by BROM/Parham volunteers in 2001/2. Two b/w
photographs published in John Warwicker’s book “Britain in Mortal Danger” (2002) show an exterior view of the
collapsed emergency exit tunnel and an interior view of the main chamber with a large heap of sand, created by this
collapse, on the floor just inside the emergency exit opening. Both photos date from before the
John Warwicker, “Britain in Mortal Danger” (2002), Stephen Lewins/CART CIO
Northumberland, Geoff Dewing, “Suffolk’s Secret Army” (1996), marked on map page 17.
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