Perhaps I should change the keypad to a key prox  with an integral reader???

That wont work, your reader is acting as a key switch. your panel is too old to support native prox

so, replace the pyronix sa reader for something similar then??

A simple keyswitch could be used.

Thing is,  I am happy to use our keypad but we have an older member of the family now who will only activate the alarm if its easy for her as she is petrified of it going off in case she does it wrong.  Key fob is perfect for her.   She is nervous of losing a key or not being able to use the key switch in time. Key fob would be the best thing for her I think.

if its working like a key switch . is it activating the key pad or the control panel directly?? 

5 minutes ago, neonred said:

if its working like a key switch . is it activating the key pad or the control panel directly?? 

Control panel 

Ok,  I had a brief look when I last introduced an extra zone PIR to the panel and I noticed that it goes across zone 1 .  Would the activation terminals be on the Trig terminals to left side of the panel under the aux supplies?? 

Thanks for your help...

you could always upgrade this important system. if its important?

Yes, I may do so but trying to hold out for a while.  To be honest I have had no problem with the panel I have expanded it to almost full capacity now  I am now just trying to get round this issue but I may well upgrade in the next couple of years or so.