The following are the YW Emergency Control Bunkers I have heard of:
Basement of YW HQ in Bradford (refurbished and still in use)
Basement of YW Offices in Skipton
Elvington (York) subject of this report
Chellow Heights (also Bradford area)
Cottingham (Mill Dam site?)
Langsett (Stocksbridge, Barnsley)
Nutwell (Cantley, Doncaster)
Deighton (Huddersfield)
Also shared with Civil Defence Bunker (ex WW2 RAF bunker) corner of Grove Road/Skipton Road, Harrogate [Building now used by NYCC Education Department]
What a hero!!!! I cannot thank you enough, I’ll get them all visited now, may I ask where you got your info from, pm if need be.