Does anyone have a Building services company standard

I have recentley started a new job, (mechanical building services cad tech)

the place i use to work use to send the drawings to designers and we just use to modify them abit, but at the place im at now we do all out own designs

the thing im trying to get as is, we dont really have no standard for drawings, the drawings get draw different alot of the time, like grills change, people never keep the same line couple or layer name

does anyone have a company standard i could use :-) or if there is a british standard somewere

for HVAC ie

ducting/ventilation

AC

Drainage

domestic services (hot and cold water)

LTHW

etc.....

hope someone could help me out

Nick