Right well all fixed got second hand one for £65:00 off of breakers
But took top off old one And could see worn circuit contact
There are 8 minute contacts that scrape the circuit board I bent carefully these little tags so they run on a good bit of circuit board and tried it by plugging it in engine bay and it cured the bad running so then I did not mind committing and buying another one as it would only last a bit before it would fail again !
When you buy another one try it in engine bay before fitting it as you really really don't want to be fitting it twice !!
Hope this helps someone !!