Just noticed that you mentioned 2 reds and 2 whites in your OP, which actually suggests you have our unresistored F10A / F10C there.  The install sheet is available at the link below:

 

http://www.knightfireandsecurity.com/uploads/F10A%20Inst%20Mini.doc

hopefully after a yr "hapoychappy" has either figured it out or given in

"...There are no resistors fitted in anything else do I need to fit them on the door contacts..."

 

If there are no resistors fitted to any other detection devices at this panel, it is conventional wiring and you should not fit resistors to any added devices unless it is specified by the manufacturer of that added device.

 

"...both of the contacts have a metal sleeve on the cable..." Follow Alyeti's advice and use junction boxes to connect into circuit.

 

"..2 red and 2 white on each of the contacts .." Subject to the approval of Spike try two whites as alarm wires and two reds as tamper..if the panel indicates a fault try the opposite.. two reds to alarm, two whites to tamper. Don't cut off the remaining 2 cores of the six core cable, terminate them at the junction boxes, they may be needed in the future (however, I am open to further correction from Spike).

hopefully after a yr "hapoychappy" has either figured it out or given in

 

   An excellent point, well made 

 

*note to self - check installer forum more often*

hopefully after a yr "hapoychappy" has either figured it out or given in

It's been that long...... To Much tsi!

Posted this in wrong thread earlier, so here it is again:

 

Thought it might be two whites Spike, those were the usual colours at one time, nice post you've made.

Thought it might be two whites Spike, those were the usual colours at one time, nice post you've made.

 

Yes, you were right Charlie.  And thanks for the condiment