"slightly offended, only asked for help. i am a fully qualified plumbing and heating engineer of 20 years so i do have a basic knowledge of electrics and the dangers of electrics. so the factors that its dead are one of on/off switch, hi/lo rocker switch, pcb, or the motor itself?"
Why on earth would you be offended? You asked for help and didn't get it, then you commented that you'd asked for help and hadn't got it. So I wrote you a reply telling you how I had interpreted your message. That's 5 minutes of my life that I won't see back. Now, if you were grateful for the trouble I'd taken to explain why I for one hadn't replied with the answer, not a problem, but slightly offended, well, golly.
Shame you didn't explain your background because that would have given us an insight into your skill set. Never mind.