1914-25 | 1938-39 | 1940 | 1941 | 1942 | 1943 | 1944 | 1945

KEY:  Rhydymwyn  UK  Europe  World



The development on plant scale of the distillation process was completed at Sutton Oak in Cheshire. This produced a mixture of 60% H and 40% T (Reports CD 1020 and CD 996). The technique was used by the Germans in WWI. The two plants that were constructed at Randle 1940 are described in Z/CK/65.

29 Sep

The Munich Agreement was signed by Germany, France, Italy and Britain. Chamberlain declared "Peace for our time".

End of year

The British Government decided that the question of storing large quantities of Pyro and Runcol in bulk with complete protection from bombs should be considered and I.C.I. was asked to submit proposals for dealing with a capacity of 1,500 tons.



Germany invaded Czechoslovakia.


The initial survey of the Rhydymwyn site was carried out.


Subsequent to identifying the Valley site, the Department of Industrial Planning discussed layouts with I.C.I..

27 Apr

Compulsory subscription for men aged 20-21 was initiated.

23 Aug

The Soviet-German non-aggression pact was signed.

24 Aug

The Emergency Powers Defence Act was passed. Military reservists were called up.

25 Aug

The UK-Polish Treaty of Alliance signed.

27 Aug

Treasury approval was given for the following sections of the Valley Works:
• Purchase of Site: £6,000
• Bulk Storage: £90,000
• Charging facilities and storage of charged weapons: £340,000
• One 50 ton Runcol plant: £105,000


Design work for the site was started and orders were placed.

1 Sep

Germany invaded Poland.

1 Sep

The evacuation of millions of children, expectant mothers and the blind was begun. The Blackout was enforced. An estimated 140,000 hospital patients were discharged releasing 187-195,000 new and old beds which were made ready for air raid casualties.

3 Sep

War was declared. Anderson shelters were delivered. Cinemas, theatres and public places were closed. The BBC closed all channels except the Home Service. Gas masks were to be carried at all times.

29 Sep

National Registration identity cards were issued.


It was understood that Treasury sanction was being sought for the erection of a 200 ton/week Pyro M plant, a 100 ton/week Runcol plant and a 10 ton/week Lewisite plant (capable of being expanded to 100 tons/week), two charging units, together equal to K1+K2+K3, and an Assembly Unit. Layouts were prepared for schemes comprising 3 x 80 ton Pyro Units, including conversion to Pyro M, 2 x 50 ton Runcol plants and Acid Concentration plants, 1 x 100 ton Lewisite plant, 2 x Charging Units and Assembly Units. At a meeting in October, it was agreed that the Valley factory should comprise of these plants except that the Lewisite plant should be of 10 tons/week.


Work was started on the tunnels to accommodate the bulk storage tanks by the contractor Halkyn and District United Mines. The main building contractor, J. B. Edwards & Co., also started work on the site.


It was agreed that the Lewisite plant should not be situated at Valley. Provisional Sanction for the expenditure of £1,750,000 was granted subject to the completion of more accurate estimates.

23 Nov

The last date to register for ration books.


Construction of the buildings for Runcol plant R4, Acid Concentration plants AC7 and 8, Pyro plant P5, Charging Unit K5 and essential services etc. was started.

13 Dec

Battle of the River Plate, Uruguay.


The Rhydymwyn Valley History Society is funded by:

Heritage Lottery Fund Subterranea Britannica Flintshire County Council Welsh Government
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