13. Salvage of building materials Ministry of Works Local authorities. 14. Building of temporary hostels Ministry of Health Bootle, Barrow, Hull, etc.) Ministry of Works. 15. Static water provision Ministry of Home Security and Ministry of Works. 16. Fire protection work, Ministry of Home duplicating mains, blast Security walls, etc. Local authorities Ministry of Works. 3. All these operations are simultaneous; all require building and civil engineering type of labour; and they require over 1/3rd of what is available.