Hi Ian and thanks.
The only flow regulator is on the outlet pipe just before the connector for the pole.
I have just double checked everything and there are no kinks etc.
I have even disconnected the brush head as I thought there may have been a blockage there but no joy.I connected my old pole and hey presto works fine.Reconnected the ergolite and still no good.
I must point out that even though the pump is cutting out there is still a good amount of water coming through the brush,enough to give a good clean in fact.
I can only assume the problem is because of the hose being that bit narrower.
Having said that I cant believe this problem hasnt been highlighted before now,surely plenty out there have poles with this hose on.
And why didnt the place I bought it from mention it.hmmmm