I have a BWS 230 angle grinder 9" .series no 015754 --
BJ 2000 with an 1850 watt motor.
The power on/off switch has broken would it be possible to supply me with a new one by post.
Did you read the name of this web site? It says "How to mend it", which is a help site, not an on-line store. You will most probably be able to get what you want off the internet, but not from this site, simples.