OK guys no need for a hall sensor i found the reason 'it was a short phase wire that was not making a good connection.
all s well again i have been to work back and fourth twice now but think its time to tweak the controller with the usb lead and pc.
the battery's are just not powerful enough to run it at the speed it is set at maybe you can help me with the parameters ?
I have also tried a no load speed test with a meter on amps and it reaches around 5amp
i'm also looking at upgrading my lead acid battery's for somethink more suitable litium lifepoe maybe you can help with that to