The only way to stop it is with killall udevd. Then when you need a usb device udevd --daemond then kill it again, Can anyone shed any light on this?

I know this is not much help;
But I would start investigating the files in /etc/udev/rules.d.

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/etc/udev/rules.d.
thanks have tried moving each file from there then starting udevd but just same every 2 second 3 more udevd appear in system activity. So moved all files from rules.d restarted udevd still same just keeps on adding udevd's any more ideas

Can you see what devices it's creating under /dev ?

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not sure how ? but if this helps
[root@localhost mick]# ps aux | grep udevd
root 12327 0.1 0.0 2340 900 ? S<s 11:09 0:00 udevd --daemon
root 12334 0.0 0.0 2336 756 ? S< 11:09 0:00 udevd --daemon
root 12338 0.0 0.0 2336 728 ? S< 11:09 0:00 udevd --daemon
root 12350 0.0 0.0 2336 756 ? S< 11:09 0:00 udevd --daemon
root 12354 0.0 0.0 2336 728 ? S< 11:09 0:00 udevd --daemon
root 12363 0.0 0.0 2336 756 ? S< 11:09 0:00 udevd --daemon
root 12367 0.0 0.0 2336 728 ? S< 11:09 0:00 udevd --daemon
root 12379 0.0 0.0 2336 756 ? S< 11:09 0:00 udevd --daemon
root 12383 0.0 0.0 2336 728 ? S< 11:09 0:00 udevd --daemon
root 12390 0.0 0.0 2336 756 ? S< 11:09 0:00 udevd --daemon
root 12394 0.0 0.0 2336 728 ? S< 11:09 0:00 udevd --daemon
root 12406 0.0 0.0 2336 756 ? S< 11:09 0:00 udevd --daemon
root 12410 0.0 0.0 2336 728 ? S< 11:09 0:00 udevd --daemon
root 12420 0.0 0.0 2336 756 ? S< 11:09 0:00 udevd --daemon
root 12424 0.0 0.0 2336 728 ? S< 11:09 0:00 udevd --daemon
root 12433 0.0 0.0 2336 756 ? S< 11:10 0:00 udevd --daemon
root 12437 0.0 0.0 2336 728 ? S< 11:10 0:00 udevd --daemon
root 12451 0.0 0.0 2336 756 ? S< 11:10 0:00 udevd --daemon
root 12455 0.0 0.0 2336 728 ? S< 11:10 0:00 udevd --daemon
root 12482 0.0 0.0 2336 756 ? S< 11:10 0:00 udevd --daemon
root 12486 0.0 0.0 2336 728 ? S< 11:10 0:00 udevd --daemon
root 12498 0.0 0.0 2336 756 ? S< 11:10 0:00 udevd --daemon
root 12502 0.0 0.0 2336 728 ? S< 11:10 0:00 udevd --daemon
root 12511 0.0 0.0 2336 756 ? S< 11:10 0:00 udevd --daemon
root 12515 0.0 0.0 2336 728 ? S< 11:10 0:00 udevd --daemon
root 12527 0.0 0.0 2336 756 ? S< 11:10 0:00 udevd --daemon
root 12532 0.0 0.0 2336 728 ? S< 11:10 0:00 udevd --daemon
root 12543 0.0 0.0 2336 756 ? S< 11:10 0:00 udevd --daemon
root 12547 0.0 0.0 2336 728 ? S< 11:10 0:00 udevd --daemon
root 12555 0.0 0.0 3268 760 pts/1 S+ 11:10 0:00 grep --color udevd

Thats from a few seconds of it running.

this may help
udevadm monitor
returns

KERNEL[1265718958.215062] add /devices/pci0000:00/0000:00:1e.0/0000:02:03.0/ssb0:0/firmware/ssb0:0 (firmware)
KERNEL[1265718958.223498] remove /devices/pci0000:00/0000:00:1e.0/0000:02:03.0/ssb0:0/firmware/ssb0:0 (firmware)
UDEV [1265718958.228773] remove /devices/pci0000:00/0000:00:1e.0/0000:02:03.0/ssb0:0/firmware/ssb0:0 (firmware)
UDEV [1265718958.233978] add /devices/pci0000:00/0000:00:1e.0/0000:02:03.0/ssb0:0/firmware/ssb0:0 (firmware)
KERNEL[1265718959.395059] add /devices/pci0000:00/0000:00:1e.0/0000:02:03.0/ssb0:0/firmware/ssb0:0 (firmware)
KERNEL[1265718959.401841] remove /devices/pci0000:00/0000:00:1e.0/0000:02:03.0/ssb0:0/firmware/ssb0:0 (firmware)
UDEV [1265718959.402770] remove /devices/pci0000:00/0000:00:1e.0/0000:02:03.0/ssb0:0/firmware/ssb0:0 (firmware)
UDEV [1265718959.410921] add /devices/pci0000:00/0000:00:1e.0/0000:02:03.0/ssb0:0/firmware/ssb0:0 (firmware)
KERNEL[1265718960.578056] add /devices/pci0000:00/0000:00:1e.0/0000:02:03.0/ssb0:0/firmware/ssb0:0 (firmware)
KERNEL[1265718960.584502] remove /devices/pci0000:00/0000:00:1e.0/0000:02:03.0/ssb0:0/firmware/ssb0:0 (firmware)
UDEV [1265718960.586192] remove /devices/pci0000:00/0000:00:1e.0/0000:02:03.0/ssb0:0/firmware/ssb0:0 (firmware)

once i start udevd as if something is being plugged then unplugged

By god I think I have found it my broadcom BCM4306 802.11b/g Wireless LAN Controller was set up with ndiswrapper but for some reason it got change to ssb module without me noticing have changed it back to ndiswrwpper and it back to normal. Thanks for the help hope somebody else finds this useful.