[Cob] getting approval for cob ovens

[Linda Royles]

Dear All
I have been asked to build a cob oven for a school here in London, UK.  
The school wants to see health and safety instructions and clearances  
for fire regulations. Any one got any sources? I have looked at the  
one "cooking with fire in public places". Does any one have anything  
more detailed for cob so that we can get approval?
Many thanks
Linda Royles
cob in the community
london, UK