Need a switching circuit that is closed when Vgs is negative and open when Vgs positive, any ideas please?
Need a switching circuit that is closed when Vgs is negative and open
  when Vgs positive, any ideas please?


OK


  Basically the inverse of Enhancement mode MOSFETs or JFETs


It's not the inverse of a p channel JFET providing you restrict the gate voltage from pushing too much current into the gate when the control voltage is negative. This can be done with a resistor and diode. 

Here's the basic characteristic of a p channel JFET: -




  I need a circuit that will be closed when Vgs is negative and open
  when Vgs positive


What constitutes and open-circuit or a closed-circuit in your book may of course be different to what I think so, you need to think about this.

Also how much negative and how much positive is something else that you need to consider.

You might also wish to consider P channel MOSFETs and PNP bipolar transistors all of which turn on the more negative the control voltage is.