On a safety course last month, the local firecrew took us through their hand signals to an aircraft.
That surprised me, as I didn't recognise them from my flying / CPL TK / etc.
Looking them up - I found them here.
https://www.caa.co.uk/docs/33/Inform...ice2013003.pdf
Just thought I'd mention it, as if I didn't know them, probably somebody else didn't either.
G